61724686375 has 72 divisors (see below), whose sum is σ = 86435753040. Its totient is φ = 43962028000.

The previous prime is 61724686349. The next prime is 61724686393. The reversal of 61724686375 is 57368642716.

It is not a de Polignac number, because 61724686375 - 2⁵ = 61724686343 is a prime.

It is a super-2 number, since 2×61724686375² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 234694494 + ... + 234694756.

It is an arithmetic number, because the mean of its divisors is an integer number (1200496570).

Almost surely, 2^61724686375 is an apocalyptic number.

61724686375 is a deficient number, since it is larger than the sum of its proper divisors (24711066665).

61724686375 is an equidigital number, since it uses as much as digits as its factorization.

61724686375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 338 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 55.

The spelling of 61724686375 in words is "sixty-one billion, seven hundred twenty-four million, six hundred eighty-six thousand, three hundred seventy-five".