2157512667 has 4 divisors (see below), whose sum is σ = 2876683560. Its totient is φ = 1438341776.

The previous prime is 2157512639. The next prime is 2157512671. The reversal of 2157512667 is 7662157512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2157512667 - 2⁸ = 2157512411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157512167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359585442 + ... + 359585447.

It is an arithmetic number, because the mean of its divisors is an integer number (719170890).

Almost surely, 2^2157512667 is an apocalyptic number.

2157512667 is a deficient number, since it is larger than the sum of its proper divisors (719170893).

2157512667 is an equidigital number, since it uses as much as digits as its factorization.

2157512667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719170892.

The product of its digits is 176400, while the sum is 42.

The square root of 2157512667 is about 46449.0330039281. The cubic root of 2157512667 is about 1292.1644385766.

The spelling of 2157512667 in words is "two billion, one hundred fifty-seven million, five hundred twelve thousand, six hundred sixty-seven".