61720502152 has 16 divisors (see below), whose sum is σ = 115733565900. Its totient is φ = 30858217920.

The previous prime is 61720502149. The next prime is 61720502153. The reversal of 61720502152 is 25120502716.

It can be written as a sum of positive squares in 2 ways, for example, as 42194911396 + 19525590756 = 205414^2 + 139734^2 .

It is a super-2 number, since 2×61720502152² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61720502153) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 121027 + ... + 371602.

Almost surely, 2^61720502152 is an apocalyptic number.

It is an amenable number.

61720502152 is a deficient number, since it is larger than the sum of its proper divisors (54013063748).

61720502152 is a wasteful number, since it uses less digits than its factorization.

61720502152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508296 (or 508292 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 61720502152 in words is "sixty-one billion, seven hundred twenty million, five hundred two thousand, one hundred fifty-two".