1656179711987 has 2 divisors, whose sum is σ = 1656179711988. Its totient is φ = 1656179711986.

The previous prime is 1656179711981. The next prime is 1656179712029. The reversal of 1656179711987 is 7891179716561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1656179711987 - 2⁴ = 1656179711971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1656179711981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828089855993 + 828089855994.

It is an arithmetic number, because the mean of its divisors is an integer number (828089855994).

Almost surely, 2^{1656179711987} is an apocalyptic number.

1656179711987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656179711987 is an equidigital number, since it uses as much as digits as its factorization.

1656179711987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40007520, while the sum is 68.

The spelling of 1656179711987 in words is "one trillion, six hundred fifty-six billion, one hundred seventy-nine million, seven hundred eleven thousand, nine hundred eighty-seven".