61231720532 has 12 divisors (see below), whose sum is σ = 107157669696. Its totient is φ = 30615243480.

The previous prime is 61231720507. The next prime is 61231720553. The reversal of 61231720532 is 23502713216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125573 + ... + 371795.

It is an arithmetic number, because the mean of its divisors is an integer number (8929805808).

Almost surely, 2^61231720532 is an apocalyptic number.

It is an amenable number.

61231720532 is a deficient number, since it is larger than the sum of its proper divisors (45925949164).

61231720532 is a wasteful number, since it uses less digits than its factorization.

61231720532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308398 (or 308396 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 61231720532 in words is "sixty-one billion, two hundred thirty-one million, seven hundred twenty thousand, five hundred thirty-two".