128625660427 has 6 divisors (see below), whose sum is σ = 141381924404. Its totient is φ = 116932418460.

The previous prime is 128625660421. The next prime is 128625660433. The reversal of 128625660427 is 724066526821.

It is an interprime number because it is at equal distance from previous prime (128625660421) and next prime (128625660433).

It is not a de Polignac number, because 128625660427 - 2¹¹ = 128625658379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128625660421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 531510873 + ... + 531511114.

Almost surely, 2^128625660427 is an apocalyptic number.

128625660427 is a deficient number, since it is larger than the sum of its proper divisors (12756263977).

128625660427 is a wasteful number, since it uses less digits than its factorization.

128625660427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063022009 (or 1063021998 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 128625660427 in words is "one hundred twenty-eight billion, six hundred twenty-five million, six hundred sixty thousand, four hundred twenty-seven".