7861786496951 has 4 divisors (see below), whose sum is σ = 7972515884304. Its totient is φ = 7751057109600.

The previous prime is 7861786496933. The next prime is 7861786496981. The reversal of 7861786496951 is 1596946871687.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7861786496951 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 (7861786496981) 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, 55364693570 + ... + 55364693711.

It is an arithmetic number, because the mean of its divisors is an integer number (1993128971076).

Almost surely, 2^{7861786496951} is an apocalyptic number.

7861786496951 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

7861786496951 is a deficient number, since it is larger than the sum of its proper divisors (110729387353).

7861786496951 is a wasteful number, since it uses less digits than its factorization.

7861786496951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110729387352.

The product of its digits is 1097349120, while the sum is 77.

The spelling of 7861786496951 in words is "seven trillion, eight hundred sixty-one billion, seven hundred eighty-six million, four hundred ninety-six thousand, nine hundred fifty-one".