1653555420 has 144 divisors (see below), whose sum is σ = 5605498080. Its totient is φ = 391065600.

The previous prime is 1653555413. The next prime is 1653555433. The reversal of 1653555420 is 245553561.

1653555420 is a `hidden beast` number, since 1 + 65 + 3 + 55 + 542 + 0 = 666.

It is a super-2 number, since 2×1653555420² = 5468491054022752800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 70996 + ... + 91364.

It is an arithmetic number, because the mean of its divisors is an integer number (38927070).

Almost surely, 2^1653555420 is an apocalyptic number.

1653555420 is a gapful number since it is divisible by the number (10) 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 1653555420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2802749040).

1653555420 is an abundant number, since it is smaller than the sum of its proper divisors (3951942660).

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

1653555420 is a wasteful number, since it uses less digits than its factorization.

1653555420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20436 (or 20431 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 1653555420 is about 40663.9326676602. The cubic root of 1653555420 is about 1182.5138926863.

The spelling of 1653555420 in words is "one billion, six hundred fifty-three million, five hundred fifty-five thousand, four hundred twenty".