139787525881 has 4 divisors (see below), whose sum is σ = 139950259600. Its totient is φ = 139624792164.

The previous prime is 139787525873. The next prime is 139787525947. The reversal of 139787525881 is 188525787931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139787525881 - 2³ = 139787525873 is a prime.

It is a super-2 number, since 2×139787525881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139787520881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81365571 + ... + 81367288.

It is an arithmetic number, because the mean of its divisors is an integer number (34987564900).

Almost surely, 2^139787525881 is an apocalyptic number.

It is an amenable number.

139787525881 is a deficient number, since it is larger than the sum of its proper divisors (162733719).

139787525881 is an equidigital number, since it uses as much as digits as its factorization.

139787525881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162733718.

The product of its digits is 33868800, while the sum is 64.

The spelling of 139787525881 in words is "one hundred thirty-nine billion, seven hundred eighty-seven million, five hundred twenty-five thousand, eight hundred eighty-one".