2156980747718 has 16 divisors (see below), whose sum is σ = 3426129595440. Its totient is φ = 1014950017536.

The previous prime is 2156980747679. The next prime is 2156980747729. The reversal of 2156980747718 is 8177470896512.

It is a super-2 number, since 2×2156980747718² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2765408 + ... + 3458531.

It is an arithmetic number, because the mean of its divisors is an integer number (214133099715).

Almost surely, 2^{2156980747718} is an apocalyptic number.

2156980747718 is a deficient number, since it is larger than the sum of its proper divisors (1269148847722).

2156980747718 is a wasteful number, since it uses less digits than its factorization.

2156980747718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6234151.

The product of its (nonzero) digits is 47416320, while the sum is 65.

The spelling of 2156980747718 in words is "two trillion, one hundred fifty-six billion, nine hundred eighty million, seven hundred forty-seven thousand, seven hundred eighteen".