77945628429 has 14 divisors (see below), whose sum is σ = 116864983086. Its totient is φ = 51963751800.

The previous prime is 77945628413. The next prime is 77945628437. The reversal of 77945628429 is 92482654977.

77945628429 is a `hidden beast` number, since 77 + 94 + 56 + 2 + 8 + 429 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60967017225 + 16978611204 = 246915^2 + 130302^2 .

It is not a de Polignac number, because 77945628429 - 2⁴ = 77945628413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77945628479) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 53459922 + ... + 53461379.

Almost surely, 2^77945628429 is an apocalyptic number.

It is an amenable number.

77945628429 is a deficient number, since it is larger than the sum of its proper divisors (38919354657).

77945628429 is an equidigital number, since it uses as much as digits as its factorization.

77945628429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106921319 (or 106921304 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 77945628429 in words is "seventy-seven billion, nine hundred forty-five million, six hundred twenty-eight thousand, four hundred twenty-nine".