56661061500 has 144 divisors (see below), whose sum is σ = 182550566016. Its totient is φ = 14788080000.

The previous prime is 56661061493. The next prime is 56661061543. The reversal of 56661061500 is 516016665.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77550 + ... + 345450.

It is an arithmetic number, because the mean of its divisors is an integer number (1267712264).

Almost surely, 2^56661061500 is an apocalyptic number.

56661061500 is a gapful number since it is divisible by the number (50) 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 56661061500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91275283008).

56661061500 is an abundant number, since it is smaller than the sum of its proper divisors (125889504516).

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

56661061500 is a wasteful number, since it uses less digits than its factorization.

56661061500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267973 (or 267958 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 56661061500 in words is "fifty-six billion, six hundred sixty-one million, sixty-one thousand, five hundred".