77908122457 has 8 divisors (see below), whose sum is σ = 84994359840. Its totient is φ = 70822498560.

The previous prime is 77908122451. The next prime is 77908122473. The reversal of 77908122457 is 75422180977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-77908122457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77908122451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135894 + ... + 417472.

It is an arithmetic number, because the mean of its divisors is an integer number (10624294980).

Almost surely, 2^77908122457 is an apocalyptic number.

It is an amenable number.

77908122457 is a deficient number, since it is larger than the sum of its proper divisors (7086237383).

77908122457 is a wasteful number, since it uses less digits than its factorization.

77908122457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306743.

The product of its (nonzero) digits is 1975680, while the sum is 52.

The spelling of 77908122457 in words is "seventy-seven billion, nine hundred eight million, one hundred twenty-two thousand, four hundred fifty-seven".