2151566157 has 32 divisors (see below), whose sum is σ = 3185078400. Its totient is φ = 1283668992.

The previous prime is 2151566117. The next prime is 2151566159. The reversal of 2151566157 is 7516651512.

It is a happy number.

It is not a de Polignac number, because 2151566157 - 2²⁰ = 2150517581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151566159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161569 + ... + 174377.

It is an arithmetic number, because the mean of its divisors is an integer number (99533700).

Almost surely, 2^2151566157 is an apocalyptic number.

It is an amenable number.

2151566157 is a deficient number, since it is larger than the sum of its proper divisors (1033512243).

2151566157 is a wasteful number, since it uses less digits than its factorization.

2151566157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12957.

The product of its digits is 63000, while the sum is 39.

The square root of 2151566157 is about 46384.9777083055. The cubic root of 2151566157 is about 1290.9761969658.

The spelling of 2151566157 in words is "two billion, one hundred fifty-one million, five hundred sixty-six thousand, one hundred fifty-seven".