611543492820 has 144 divisors (see below), whose sum is σ = 1999505748240. Its totient is φ = 150398373888.

The previous prime is 611543492803. The next prime is 611543492849. The reversal of 611543492820 is 28294345116.

611543492820 is a `hidden beast` number, since 6 + 1 + 154 + 3 + 492 + 8 + 2 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 117576295236 + 493967197584 = 342894^2 + 702828^2 .

It is a super-2 number, since 2×611543492820² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2496796 + ... + 2730764.

It is an arithmetic number, because the mean of its divisors is an integer number (13885456585).

Almost surely, 2^611543492820 is an apocalyptic number.

611543492820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 611543492820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999752874120).

611543492820 is an abundant number, since it is smaller than the sum of its proper divisors (1387962255420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

611543492820 is a wasteful number, since it uses less digits than its factorization.

611543492820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235114 (or 235109 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 611543492820 in words is "six hundred eleven billion, five hundred forty-three million, four hundred ninety-two thousand, eight hundred twenty".