61655233500 has 576 divisors, whose sum is σ = 232063942656. Its totient is φ = 13483584000.

The previous prime is 61655233499. The next prime is 61655233547. The reversal of 61655233500 is 533255616.

61655233500 is a `hidden beast` number, since 61 + 65 + 5 + 2 + 33 + 500 = 666.

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 191 ways as a sum of consecutive naturals, for example, 100579194 + ... + 100579806.

Almost surely, 2^61655233500 is an apocalyptic number.

61655233500 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 61655233500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116031971328).

61655233500 is an abundant number, since it is smaller than the sum of its proper divisors (170408709156).

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

61655233500 is a wasteful number, since it uses less digits than its factorization.

61655233500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 764 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The spelling of 61655233500 in words is "sixty-one billion, six hundred fifty-five million, two hundred thirty-three thousand, five hundred".