77780000051 has 4 divisors (see below), whose sum is σ = 83763076992. Its totient is φ = 71796923112.

The previous prime is 77779999951. The next prime is 77780000071. The reversal of 77780000051 is 15000008777.

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 77780000051 - 2¹⁸ = 77779737907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77779999966 and 77780000020.

It is not an unprimeable number, because it can be changed into a prime (77780000071) 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, 2991538451 + ... + 2991538476.

It is an arithmetic number, because the mean of its divisors is an integer number (20940769248).

Almost surely, 2^77780000051 is an apocalyptic number.

77780000051 is a deficient number, since it is larger than the sum of its proper divisors (5983076941).

77780000051 is a wasteful number, since it uses less digits than its factorization.

77780000051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5983076940.

The product of its (nonzero) digits is 13720, while the sum is 35.

The spelling of 77780000051 in words is "seventy-seven billion, seven hundred eighty million, fifty-one", and thus it is an aban number.