61618661184 has 56 divisors (see below), whose sum is σ = 163051744000. Its totient is φ = 20537155584.

The previous prime is 61618661179. The next prime is 61618661191. The reversal of 61618661184 is 48116681616.

It is a super-2 number, since 2×61618661184² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2531697 + ... + 2555919.

Almost surely, 2^61618661184 is an apocalyptic number.

61618661184 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61618661184 is an abundant number, since it is smaller than the sum of its proper divisors (101433082816).

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

61618661184 is a wasteful number, since it uses less digits than its factorization.

61618661184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37487 (or 37477 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The spelling of 61618661184 in words is "sixty-one billion, six hundred eighteen million, six hundred sixty-one thousand, one hundred eighty-four".