215695251157 has 4 divisors (see below), whose sum is σ = 215699778316. Its totient is φ = 215690724000.

The previous prime is 215695251077. The next prime is 215695251173. The reversal of 215695251157 is 751152596512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 213555818641 + 2139432516 = 462121^2 + 46254^2 .

It is a cyclic number.

It is not a de Polignac number, because 215695251157 - 2⁷ = 215695251029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215695251157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215695251257) 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, 2191344 + ... + 2287657.

It is an arithmetic number, because the mean of its divisors is an integer number (53924944579).

Almost surely, 2^215695251157 is an apocalyptic number.

It is an amenable number.

215695251157 is a deficient number, since it is larger than the sum of its proper divisors (4527159).

215695251157 is an equidigital number, since it uses as much as digits as its factorization.

215695251157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527158.

The product of its digits is 945000, while the sum is 49.

The spelling of 215695251157 in words is "two hundred fifteen billion, six hundred ninety-five million, two hundred fifty-one thousand, one hundred fifty-seven".