77621451551 has 16 divisors (see below), whose sum is σ = 90606942720. Its totient is φ = 65123624160.

The previous prime is 77621451487. The next prime is 77621451569. The reversal of 77621451551 is 15515412677.

It is not a de Polignac number, because 77621451551 - 2⁶ = 77621451487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77621751551) 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, 492716 + ... + 630881.

It is an arithmetic number, because the mean of its divisors is an integer number (5662933920).

Almost surely, 2^77621451551 is an apocalyptic number.

77621451551 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

77621451551 is a deficient number, since it is larger than the sum of its proper divisors (12985491169).

77621451551 is a wasteful number, since it uses less digits than its factorization.

77621451551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123814.

The product of its digits is 294000, while the sum is 44.

The spelling of 77621451551 in words is "seventy-seven billion, six hundred twenty-one million, four hundred fifty-one thousand, five hundred fifty-one".