77975293149 has 12 divisors (see below), whose sum is σ = 121294900636. Its totient is φ = 47984795712.

The previous prime is 77975293091. The next prime is 77975293157. The reversal of 77975293149 is 94139257977.

77975293149 is a `hidden beast` number, since 7 + 7 + 97 + 529 + 3 + 14 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 50645252025 + 27330041124 = 225045^2 + 165318^2 .

It is not a de Polignac number, because 77975293149 - 2²⁵ = 77941738717 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77975293199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 333227632 + ... + 333227865.

Almost surely, 2^77975293149 is an apocalyptic number.

It is an amenable number.

77975293149 is a deficient number, since it is larger than the sum of its proper divisors (43319607487).

77975293149 is a wasteful number, since it uses less digits than its factorization.

77975293149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666455516 (or 666455513 counting only the distinct ones).

The product of its digits is 30005640, while the sum is 63.

The spelling of 77975293149 in words is "seventy-seven billion, nine hundred seventy-five million, two hundred ninety-three thousand, one hundred forty-nine".