76605587774921 has 4 divisors (see below), whose sum is σ = 76610690406852. Its totient is φ = 76600485142992.

The previous prime is 76605587774917. The next prime is 76605587774939. The reversal of 76605587774921 is 12947778550667.

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 25415068664896 + 51190519110025 = 5041336^2 + 7154755^2 .

It is a cyclic number.

It is not a de Polignac number, because 76605587774921 - 2² = 76605587774917 is a prime.

It is a super-2 number, since 2×76605587774921² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76605587774321) 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, 2551293446 + ... + 2551323471.

It is an arithmetic number, because the mean of its divisors is an integer number (19152672601713).

Almost surely, 2^{76605587774921} is an apocalyptic number.

It is an amenable number.

76605587774921 is a deficient number, since it is larger than the sum of its proper divisors (5102631931).

76605587774921 is a wasteful number, since it uses less digits than its factorization.

76605587774921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5102631930.

The product of its (nonzero) digits is 1244678400, while the sum is 74.

The spelling of 76605587774921 in words is "seventy-six trillion, six hundred five billion, five hundred eighty-seven million, seven hundred seventy-four thousand, nine hundred twenty-one".