7977263800561 has 4 divisors (see below), whose sum is σ = 8702469600624. Its totient is φ = 7252058000500.

The previous prime is 7977263800559. The next prime is 7977263800577. The reversal of 7977263800561 is 1650083627797.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7977263800561 - 2¹ = 7977263800559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7977263800561.

It is not an unprimeable number, because it can be changed into a prime (7977263800501) 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, 362602900015 + ... + 362602900036.

It is an arithmetic number, because the mean of its divisors is an integer number (2175617400156).

Almost surely, 2^{7977263800561} is an apocalyptic number.

It is an amenable number.

7977263800561 is a deficient number, since it is larger than the sum of its proper divisors (725205800063).

7977263800561 is a wasteful number, since it uses less digits than its factorization.

7977263800561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725205800062.

The product of its (nonzero) digits is 26671680, while the sum is 61.

The spelling of 7977263800561 in words is "seven trillion, nine hundred seventy-seven billion, two hundred sixty-three million, eight hundred thousand, five hundred sixty-one".