2151900668 has 6 divisors (see below), whose sum is σ = 3765826176. Its totient is φ = 1075950332.

The previous prime is 2151900637. The next prime is 2151900701. The reversal of 2151900668 is 8660091512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268987580 + ... + 268987587.

It is an arithmetic number, because the mean of its divisors is an integer number (627637696).

Almost surely, 2^2151900668 is an apocalyptic number.

It is an amenable number.

2151900668 is a deficient number, since it is larger than the sum of its proper divisors (1613925508).

2151900668 is a wasteful number, since it uses less digits than its factorization.

2151900668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537975171 (or 537975169 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 2151900668 is about 46388.5833799654. The cubic root of 2151900668 is about 1291.0430975906.

The spelling of 2151900668 in words is "two billion, one hundred fifty-one million, nine hundred thousand, six hundred sixty-eight".