2157816698 has 8 divisors (see below), whose sum is σ = 3427120692. Its totient is φ = 1015443136.

The previous prime is 2157816667. The next prime is 2157816743. The reversal of 2157816698 is 8966187512.

2157816698 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2111126809 + 46689889 = 45947^2 + 6833^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31732565 + ... + 31732632.

Almost surely, 2^2157816698 is an apocalyptic number.

2157816698 is a deficient number, since it is larger than the sum of its proper divisors (1269303994).

2157816698 is a wasteful number, since it uses less digits than its factorization.

2157816698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63465216.

The product of its digits is 1451520, while the sum is 53.

The square root of 2157816698 is about 46452.3056263088. The cubic root of 2157816698 is about 1292.2251318617.

The spelling of 2157816698 in words is "two billion, one hundred fifty-seven million, eight hundred sixteen thousand, six hundred ninety-eight".