77491716415 has 4 divisors (see below), whose sum is σ = 92990059704. Its totient is φ = 61993373128.

The previous prime is 77491716413. The next prime is 77491716431. The reversal of 77491716415 is 51461719477.

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 77491716415 - 2¹ = 77491716413 is a prime.

It is a super-2 number, since 2×77491716415² (a number of 23 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 (77491716413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7749171637 + ... + 7749171646.

It is an arithmetic number, because the mean of its divisors is an integer number (23247514926).

Almost surely, 2^77491716415 is an apocalyptic number.

77491716415 is a deficient number, since it is larger than the sum of its proper divisors (15498343289).

77491716415 is a wasteful number, since it uses less digits than its factorization.

77491716415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15498343288.

The product of its digits is 1481760, while the sum is 52.

The spelling of 77491716415 in words is "seventy-seven billion, four hundred ninety-one million, seven hundred sixteen thousand, four hundred fifteen".