5651991215 has 16 divisors (see below), whose sum is σ = 7347345600. Its totient is φ = 4173770016.

The previous prime is 5651991211. The next prime is 5651991263. The reversal of 5651991215 is 5121991565.

It is a happy number.

It is not a de Polignac number, because 5651991215 - 2² = 5651991211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651991211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246275 + ... + 268244.

It is an arithmetic number, because the mean of its divisors is an integer number (459209100).

Almost surely, 2^5651991215 is an apocalyptic number.

5651991215 is a deficient number, since it is larger than the sum of its proper divisors (1695354385).

5651991215 is an equidigital number, since it uses as much as digits as its factorization.

5651991215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514563 (or 514537 counting only the distinct ones).

The product of its digits is 121500, while the sum is 44.

The square root of 5651991215 is about 75179.7260902166. The cubic root of 5651991215 is about 1781.2867032716.

The spelling of 5651991215 in words is "five billion, six hundred fifty-one million, nine hundred ninety-one thousand, two hundred fifteen".