77256021755 has 8 divisors (see below), whose sum is σ = 101135155824. Its totient is φ = 56186197600.

The previous prime is 77256021751. The next prime is 77256021757. The reversal of 77256021755 is 55712065277.

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

It is not a de Polignac number, because 77256021755 - 2² = 77256021751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77256021751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702327416 + ... + 702327525.

It is an arithmetic number, because the mean of its divisors is an integer number (12641894478).

Almost surely, 2^77256021755 is an apocalyptic number.

77256021755 is a deficient number, since it is larger than the sum of its proper divisors (23879134069).

77256021755 is a wasteful number, since it uses less digits than its factorization.

77256021755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404654957.

The product of its (nonzero) digits is 1029000, while the sum is 47.

The spelling of 77256021755 in words is "seventy-seven billion, two hundred fifty-six million, twenty-one thousand, seven hundred fifty-five".