7712187513661 has 4 divisors (see below), whose sum is σ = 7712264365312. Its totient is φ = 7712110662012.

The previous prime is 7712187513647. The next prime is 7712187513671. The reversal of 7712187513661 is 1663157812177.

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 7712187513661 - 2²⁵ = 7712153959229 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 (7712187513671) 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, 38275101 + ... + 38476066.

It is an arithmetic number, because the mean of its divisors is an integer number (1928066091328).

Almost surely, 2^{7712187513661} is an apocalyptic number.

It is an amenable number.

7712187513661 is a deficient number, since it is larger than the sum of its proper divisors (76851651).

7712187513661 is a wasteful number, since it uses less digits than its factorization.

7712187513661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76851650.

The product of its digits is 2963520, while the sum is 55.

The spelling of 7712187513661 in words is "seven trillion, seven hundred twelve billion, one hundred eighty-seven million, five hundred thirteen thousand, six hundred sixty-one".