2157919371066 has 16 divisors (see below), whose sum is σ = 4315878914688. Its totient is φ = 719299761600.

The previous prime is 2157919371059. The next prime is 2157919371067. The reversal of 2157919371066 is 6601739197512.

It is a junction number, because it is equal to n+sod(n) for n = 2157919370997 and 2157919371015.

It is not an unprimeable number, because it can be changed into a prime (2157919371067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 951570 + ... + 2285021.

It is an arithmetic number, because the mean of its divisors is an integer number (269742432168).

Almost surely, 2^{2157919371066} is an apocalyptic number.

2157919371066 is an abundant number, since it is smaller than the sum of its proper divisors (2157959543622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157919371066 is a wasteful number, since it uses less digits than its factorization.

2157919371066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347717.

The product of its (nonzero) digits is 4286520, while the sum is 57.

The spelling of 2157919371066 in words is "two trillion, one hundred fifty-seven billion, nine hundred nineteen million, three hundred seventy-one thousand, sixty-six".