76621661232566 has 4 divisors (see below), whose sum is σ = 114932491848852. Its totient is φ = 38310830616282.

The previous prime is 76621661232553. The next prime is 76621661232577. The reversal of 76621661232566 is 66523216612667.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19155415308140 + ... + 19155415308143.

It is an arithmetic number, because the mean of its divisors is an integer number (28733122962213).

Almost surely, 2^{76621661232566} is an apocalyptic number.

76621661232566 is a deficient number, since it is larger than the sum of its proper divisors (38310830616286).

76621661232566 is a wasteful number, since it uses less digits than its factorization.

76621661232566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38310830616285.

The product of its digits is 39191040, while the sum is 59.

The spelling of 76621661232566 in words is "seventy-six trillion, six hundred twenty-one billion, six hundred sixty-one million, two hundred thirty-two thousand, five hundred sixty-six".