76015797821 has 4 divisors (see below), whose sum is σ = 76298384700. Its totient is φ = 75733210944.

The previous prime is 76015797799. The next prime is 76015797833. The reversal of 76015797821 is 12879751067.

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 1383021721 + 74632776100 = 37189^2 + 273190^2 .

It is a cyclic number.

It is not a de Polignac number, because 76015797821 - 2¹⁰ = 76015796797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76015797421) 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, 141293036 + ... + 141293573.

It is an arithmetic number, because the mean of its divisors is an integer number (19074596175).

Almost surely, 2^76015797821 is an apocalyptic number.

It is an amenable number.

76015797821 is a deficient number, since it is larger than the sum of its proper divisors (282586879).

76015797821 is a wasteful number, since it uses less digits than its factorization.

76015797821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282586878.

The product of its (nonzero) digits is 1481760, while the sum is 53.

The spelling of 76015797821 in words is "seventy-six billion, fifteen million, seven hundred ninety-seven thousand, eight hundred twenty-one".