77866409051 has 4 divisors (see below), whose sum is σ = 82446786072. Its totient is φ = 73286032032.

The previous prime is 77866409009. The next prime is 77866409107. The reversal of 77866409051 is 15090466877.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77866409051 - 2¹⁰ = 77866408027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77866408984 and 77866409002.

It is not an unprimeable number, because it can be changed into a prime (77866409251) 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, 2290188485 + ... + 2290188518.

It is an arithmetic number, because the mean of its divisors is an integer number (20611696518).

Almost surely, 2^77866409051 is an apocalyptic number.

77866409051 is a deficient number, since it is larger than the sum of its proper divisors (4580377021).

77866409051 is a wasteful number, since it uses less digits than its factorization.

77866409051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4580377020.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 77866409051 in words is "seventy-seven billion, eight hundred sixty-six million, four hundred nine thousand, fifty-one".