77856315313471 has 4 divisors (see below), whose sum is σ = 77856863619744. Its totient is φ = 77855767007200.

The previous prime is 77856315313459. The next prime is 77856315313499. The reversal of 77856315313471 is 17431351365877.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77856315313471 is a prime.

It is a super-3 number, since 3×77856315313471³ (a number of 43 digits) contains 333 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 (77856315311471) 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, 273940090 + ... + 274224151.

It is an arithmetic number, because the mean of its divisors is an integer number (19464215904936).

Almost surely, 2^{77856315313471} is an apocalyptic number.

77856315313471 is a deficient number, since it is larger than the sum of its proper divisors (548306273).

77856315313471 is a wasteful number, since it uses less digits than its factorization.

77856315313471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548306272.

The product of its digits is 44452800, while the sum is 61.

The spelling of 77856315313471 in words is "seventy-seven trillion, eight hundred fifty-six billion, three hundred fifteen million, three hundred thirteen thousand, four hundred seventy-one".