76776481803961 has 3 divisors (see below), whose sum is σ = 76776490566181. Its totient is φ = 76776473041742.

The previous prime is 76776481803919. The next prime is 76776481803977. The reversal of 76776481803961 is 16930818467767.

The square root of 76776481803961 is 8762219.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 76776481803961 - 2²¹ = 76776479706809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76776481803361) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4381110 + ... + 13143328.

Almost surely, 2^{76776481803961} is an apocalyptic number.

76776481803961 is the 8762219-th square number.

76776481803961 is the 4381110-th centered octagonal number.

It is an amenable number.

76776481803961 is a deficient number, since it is larger than the sum of its proper divisors (8762220).

76776481803961 is an frugal number, since it uses more digits than its factorization.

76776481803961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17524438 (or 8762219 counting only the distinct ones).

The product of its (nonzero) digits is 512096256, while the sum is 73.

The spelling of 76776481803961 in words is "seventy-six trillion, seven hundred seventy-six billion, four hundred eighty-one million, eight hundred three thousand, nine hundred sixty-one".