2157161786318 has 32 divisors (see below), whose sum is σ = 4067512996608. Its totient is φ = 840452636760.

The previous prime is 2157161786303. The next prime is 2157161786323. The reversal of 2157161786318 is 8136871617512.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57863780 + ... + 57901047.

It is an arithmetic number, because the mean of its divisors is an integer number (127109781144).

Almost surely, 2^{2157161786318} is an apocalyptic number.

2157161786318 is a deficient number, since it is larger than the sum of its proper divisors (1910351210290).

2157161786318 is a wasteful number, since it uses less digits than its factorization.

2157161786318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115764869 (or 115764847 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 56.

The spelling of 2157161786318 in words is "two trillion, one hundred fifty-seven billion, one hundred sixty-one million, seven hundred eighty-six thousand, three hundred eighteen".