61101666540 has 72 divisors (see below), whose sum is σ = 185365121760. Its totient is φ = 16291720704.

The previous prime is 61101666529. The next prime is 61101666547. The reversal of 61101666540 is 4566610116.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 61101666495 and 61101666504.

It is not an unprimeable number, because it can be changed into a prime (61101666547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1871476 + ... + 1903844.

It is an arithmetic number, because the mean of its divisors is an integer number (2574515580).

Almost surely, 2^61101666540 is an apocalyptic number.

61101666540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61101666540 is an abundant number, since it is smaller than the sum of its proper divisors (124263455220).

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

61101666540 is a wasteful number, since it uses less digits than its factorization.

61101666540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42871 (or 42866 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 61101666540 in words is "sixty-one billion, one hundred one million, six hundred sixty-six thousand, five hundred forty".