139684256523 has 24 divisors (see below), whose sum is σ = 230602495968. Its totient is φ = 79815209472.

The previous prime is 139684256429. The next prime is 139684256533. The reversal of 139684256523 is 325652486931.

It is a happy number.

139684256523 is a `hidden beast` number, since 1 + 3 + 9 + 68 + 4 + 2 + 56 + 523 = 666.

It is not a de Polignac number, because 139684256523 - 2⁹ = 139684256011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139684256523.

It is not an unprimeable number, because it can be changed into a prime (139684256533) 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, 1363861 + ... + 1462697.

It is an arithmetic number, because the mean of its divisors is an integer number (9608437332).

Almost surely, 2^139684256523 is an apocalyptic number.

139684256523 is a deficient number, since it is larger than the sum of its proper divisors (90918239445).

139684256523 is a wasteful number, since it uses less digits than its factorization.

139684256523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121283 (or 121280 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The spelling of 139684256523 in words is "one hundred thirty-nine billion, six hundred eighty-four million, two hundred fifty-six thousand, five hundred twenty-three".