138989462645 has 54 divisors (see below), whose sum is σ = 191936853654. Its totient is φ = 96541602080.

The previous prime is 138989462603. The next prime is 138989462657. The reversal of 138989462645 is 546264989831.

It can be written as a sum of positive squares in only one way, i.e., 111191570116 + 27797892529 = 333454^2 + 166727^2 .

It is not a de Polignac number, because 138989462645 - 2⁸ = 138989462389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 210909326 + ... + 210909984.

Almost surely, 2^138989462645 is an apocalyptic number.

It is an amenable number.

138989462645 is a deficient number, since it is larger than the sum of its proper divisors (52947391009).

138989462645 is an frugal number, since it uses more digits than its factorization.

138989462645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391 (or 698 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 65.

The spelling of 138989462645 in words is "one hundred thirty-eight billion, nine hundred eighty-nine million, four hundred sixty-two thousand, six hundred forty-five".