2157356680 has 16 divisors (see below), whose sum is σ = 4854052620. Its totient is φ = 862942656.

The previous prime is 2157356659. The next prime is 2157356717. The reversal of 2157356680 is 866537512.

It can be written as a sum of positive squares in 2 ways, for example, as 2026620324 + 130736356 = 45018^2 + 11434^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26966919 + ... + 26966998.

Almost surely, 2^2157356680 is an apocalyptic number.

2157356680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157356680 is an abundant number, since it is smaller than the sum of its proper divisors (2696695940).

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

2157356680 is a wasteful number, since it uses less digits than its factorization.

2157356680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53933928 (or 53933924 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 2157356680 is about 46447.3538535835. The cubic root of 2157356680 is about 1292.1332968958.

The spelling of 2157356680 in words is "two billion, one hundred fifty-seven million, three hundred fifty-six thousand, six hundred eighty".