77955888457 has 4 divisors (see below), whose sum is σ = 78325347856. Its totient is φ = 77586429060.

The previous prime is 77955888421. The next prime is 77955888463. The reversal of 77955888457 is 75488855977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77955888457 - 2³¹ = 75808404809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77955888457.

It is not an unprimeable number, because it can be changed into a prime (77955888487) 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, 184729383 + ... + 184729804.

It is an arithmetic number, because the mean of its divisors is an integer number (19581336964).

Almost surely, 2^77955888457 is an apocalyptic number.

It is an amenable number.

77955888457 is a deficient number, since it is larger than the sum of its proper divisors (369459399).

77955888457 is a wasteful number, since it uses less digits than its factorization.

77955888457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369459398.

The product of its digits is 790272000, while the sum is 73.

The spelling of 77955888457 in words is "seventy-seven billion, nine hundred fifty-five million, eight hundred eighty-eight thousand, four hundred fifty-seven".