77504165125261 has 4 divisors (see below), whose sum is σ = 88576188714592. Its totient is φ = 66432141535932.

The previous prime is 77504165125259. The next prime is 77504165125273. The reversal of 77504165125261 is 16252156140577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77504165125261 - 2¹ = 77504165125259 is a prime.

It is a super-2 number, since 2×77504165125261² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77504165125199 and 77504165125208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77504165125291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5536011794655 + ... + 5536011794668.

It is an arithmetic number, because the mean of its divisors is an integer number (22144047178648).

Almost surely, 2^{77504165125261} is an apocalyptic number.

It is an amenable number.

77504165125261 is a deficient number, since it is larger than the sum of its proper divisors (11072023589331).

77504165125261 is a wasteful number, since it uses less digits than its factorization.

77504165125261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11072023589330.

The product of its (nonzero) digits is 3528000, while the sum is 52.

The spelling of 77504165125261 in words is "seventy-seven trillion, five hundred four billion, one hundred sixty-five million, one hundred twenty-five thousand, two hundred sixty-one".