77412331551 has 4 divisors (see below), whose sum is σ = 103216442072. Its totient is φ = 51608221032.

The previous prime is 77412331523. The next prime is 77412331561. The reversal of 77412331551 is 15513321477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15513321477 = 3 ⋅5171107159.

It is a de Polignac number, because none of the positive numbers 2^k-77412331551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77412331561) 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, 12902055256 + ... + 12902055261.

It is an arithmetic number, because the mean of its divisors is an integer number (25804110518).

Almost surely, 2^77412331551 is an apocalyptic number.

77412331551 is a deficient number, since it is larger than the sum of its proper divisors (25804110521).

77412331551 is a wasteful number, since it uses less digits than its factorization.

77412331551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25804110520.

The product of its digits is 88200, while the sum is 39.

The spelling of 77412331551 in words is "seventy-seven billion, four hundred twelve million, three hundred thirty-one thousand, five hundred fifty-one".