77904853255591 has 4 divisors (see below), whose sum is σ = 77907000791752. Its totient is φ = 77902705719432.

The previous prime is 77904853255571. The next prime is 77904853255613. The reversal of 77904853255591 is 19555235840977.

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 77904853255591 - 2²¹ = 77904851158439 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 77904853255591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77904853255511) 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, 1073713665 + ... + 1073786218.

It is an arithmetic number, because the mean of its divisors is an integer number (19476750197938).

Almost surely, 2^{77904853255591} is an apocalyptic number.

77904853255591 is a deficient number, since it is larger than the sum of its proper divisors (2147536161).

77904853255591 is a wasteful number, since it uses less digits than its factorization.

77904853255591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147536160.

The product of its (nonzero) digits is 476280000, while the sum is 70.

The spelling of 77904853255591 in words is "seventy-seven trillion, nine hundred four billion, eight hundred fifty-three million, two hundred fifty-five thousand, five hundred ninety-one".