76042745021 has 4 divisors (see below), whose sum is σ = 76597801692. Its totient is φ = 75487688352.

The previous prime is 76042745017. The next prime is 76042745027. The reversal of 76042745021 is 12054724067.

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 22859928025 + 53182816996 = 151195^2 + 230614^2 .

It is a cyclic number.

It is not a de Polignac number, because 76042745021 - 2² = 76042745017 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 (76042745027) 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, 277528130 + ... + 277528403.

It is an arithmetic number, because the mean of its divisors is an integer number (19149450423).

Almost surely, 2^76042745021 is an apocalyptic number.

It is an amenable number.

76042745021 is a deficient number, since it is larger than the sum of its proper divisors (555056671).

76042745021 is a wasteful number, since it uses less digits than its factorization.

76042745021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555056670.

The product of its (nonzero) digits is 94080, while the sum is 38.

The spelling of 76042745021 in words is "seventy-six billion, forty-two million, seven hundred forty-five thousand, twenty-one".