2151166544 has 20 divisors (see below), whose sum is σ = 4246526196. Its totient is φ = 1055288832.

The previous prime is 2151166541. The next prime is 2151166571. The reversal of 2151166544 is 4456611512.

It can be written as a sum of positive squares in 2 ways, for example, as 870958144 + 1280208400 = 29512^2 + 35780^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151166541) 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, 1267529 + ... + 1269224.

Almost surely, 2^2151166544 is an apocalyptic number.

It is an amenable number.

2151166544 is a deficient number, since it is larger than the sum of its proper divisors (2095359652).

2151166544 is a wasteful number, since it uses less digits than its factorization.

2151166544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536814 (or 2536808 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 2151166544 is about 46380.6699391029. The cubic root of 2151166544 is about 1290.8962671572.

The spelling of 2151166544 in words is "two billion, one hundred fifty-one million, one hundred sixty-six thousand, five hundred forty-four".