139640449523 has 2 divisors, whose sum is σ = 139640449524. Its totient is φ = 139640449522.

The previous prime is 139640449519. The next prime is 139640449537. The reversal of 139640449523 is 325944046931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139640449523 - 2² = 139640449519 is a prime.

It is not a weakly prime, because it can be changed into another prime (139640448523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69820224761 + 69820224762.

It is an arithmetic number, because the mean of its divisors is an integer number (69820224762).

Almost surely, 2^139640449523 is an apocalyptic number.

139640449523 is a deficient number, since it is larger than the sum of its proper divisors (1).

139640449523 is an equidigital number, since it uses as much as digits as its factorization.

139640449523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 139640449523 in words is "one hundred thirty-nine billion, six hundred forty million, four hundred forty-nine thousand, five hundred twenty-three".