61729157739172 has 96 divisors (see below), whose sum is σ = 138965386162176. Its totient is φ = 23295945600000.

The previous prime is 61729157739169. The next prime is 61729157739199. The reversal of 61729157739172 is 27193775192716.

It is a junction number, because it is equal to n+sod(n) for n = 61729157739098 and 61729157739107.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20576454 + ... + 23384797.

It is an arithmetic number, because the mean of its divisors is an integer number (1447556105856).

Almost surely, 2^{61729157739172} is an apocalyptic number.

It is an amenable number.

61729157739172 is an abundant number, since it is smaller than the sum of its proper divisors (77236228423004).

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

61729157739172 is a wasteful number, since it uses less digits than its factorization.

61729157739172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43961417 (or 43961415 counting only the distinct ones).

The product of its digits is 70013160, while the sum is 67.

The spelling of 61729157739172 in words is "sixty-one trillion, seven hundred twenty-nine billion, one hundred fifty-seven million, seven hundred thirty-nine thousand, one hundred seventy-two".