128207677231 has 2 divisors, whose sum is σ = 128207677232. Its totient is φ = 128207677230.

The previous prime is 128207677133. The next prime is 128207677249. The reversal of 128207677231 is 132776702821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128207677231 - 2¹⁵ = 128207644463 is a prime.

It is a super-2 number, since 2×128207677231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128207677331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64103838615 + 64103838616.

It is an arithmetic number, because the mean of its divisors is an integer number (64103838616).

Almost surely, 2^128207677231 is an apocalyptic number.

128207677231 is a deficient number, since it is larger than the sum of its proper divisors (1).

128207677231 is an equidigital number, since it uses as much as digits as its factorization.

128207677231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 128207677231 in words is "one hundred twenty-eight billion, two hundred seven million, six hundred seventy-seven thousand, two hundred thirty-one".