77125074777 has 14 divisors (see below), whose sum is σ = 115634715402. Its totient is φ = 51416716032.

The previous prime is 77125074749. The next prime is 77125074779. The reversal of 77125074777 is 77747052177.

It can be written as a sum of positive squares in only one way, i.e., 74173977801 + 2951096976 = 272349^2 + 54324^2 .

It is not a de Polignac number, because 77125074777 - 2⁶ = 77125074713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77125074779) 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, 52897128 + ... + 52898585.

Almost surely, 2^77125074777 is an apocalyptic number.

It is an amenable number.

77125074777 is a deficient number, since it is larger than the sum of its proper divisors (38509640625).

77125074777 is an equidigital number, since it uses as much as digits as its factorization.

77125074777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105795731 (or 105795716 counting only the distinct ones).

The product of its (nonzero) digits is 4705960, while the sum is 54.

It can be divided in two parts, 7712507 and 4777, that added together give a square (7717284 = 2778²).

The spelling of 77125074777 in words is "seventy-seven billion, one hundred twenty-five million, seventy-four thousand, seven hundred seventy-seven".