61801231572 has 72 divisors (see below), whose sum is σ = 160496402976. Its totient is φ = 20036839104.

The previous prime is 61801231567. The next prime is 61801231573. The reversal of 61801231572 is 27513210816.

61801231572 is a `hidden beast` number, since 6 + 1 + 80 + 1 + 2 + 3 + 1 + 572 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61801231573) 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, 5219523 + ... + 5231349.

It is an arithmetic number, because the mean of its divisors is an integer number (2229116708).

Almost surely, 2^61801231572 is an apocalyptic number.

It is an amenable number.

61801231572 is an abundant number, since it is smaller than the sum of its proper divisors (98695171404).

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

61801231572 is a wasteful number, since it uses less digits than its factorization.

61801231572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15797 (or 15792 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 61801231572 in words is "sixty-one billion, eight hundred one million, two hundred thirty-one thousand, five hundred seventy-two".