77767818864551 has 16 divisors (see below), whose sum is σ = 80031372632640. Its totient is φ = 75534254664960.

The previous prime is 77767818864529. The next prime is 77767818864611. The reversal of 77767818864551 is 15546881876777.

It is not a de Polignac number, because 77767818864551 - 2³⁰ = 77766745122727 is a prime.

It is a super-2 number, since 2×77767818864551² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77767818863551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13808681 + ... + 18606861.

It is an arithmetic number, because the mean of its divisors is an integer number (5001960789540).

Almost surely, 2^{77767818864551} is an apocalyptic number.

77767818864551 is a deficient number, since it is larger than the sum of its proper divisors (2263553768089).

77767818864551 is a wasteful number, since it uses less digits than its factorization.

77767818864551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4801306.

The product of its digits is 4425523200, while the sum is 80.

The spelling of 77767818864551 in words is "seventy-seven trillion, seven hundred sixty-seven billion, eight hundred eighteen million, eight hundred sixty-four thousand, five hundred fifty-one".