76801640505857 has 4 divisors (see below), whose sum is σ = 76801661205060. Its totient is φ = 76801619806656.

The previous prime is 76801640505853. The next prime is 76801640505871. The reversal of 76801640505857 is 75850504610867.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20874216706561 + 55927423799296 = 4568831^2 + 7478464^2 .

It is a cyclic number.

It is not a de Polignac number, because 76801640505857 - 2² = 76801640505853 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 76801640505857.

It is not an unprimeable number, because it can be changed into a prime (76801640505853) 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, 3083732 + ... + 12771557.

It is an arithmetic number, because the mean of its divisors is an integer number (19200415301265).

Almost surely, 2^{76801640505857} is an apocalyptic number.

It is an amenable number.

76801640505857 is a deficient number, since it is larger than the sum of its proper divisors (20699203).

76801640505857 is a wasteful number, since it uses less digits than its factorization.

76801640505857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20699202.

The product of its (nonzero) digits is 56448000, while the sum is 62.

The spelling of 76801640505857 in words is "seventy-six trillion, eight hundred one billion, six hundred forty million, five hundred five thousand, eight hundred fifty-seven".