6665722515 has 24 divisors (see below), whose sum is σ = 11561181840. Its totient is φ = 3552817344.

The previous prime is 6665722493. The next prime is 6665722537. The reversal of 6665722515 is 5152275666.

It is an interprime number because it is at equal distance from previous prime (6665722493) and next prime (6665722537).

It is not a de Polignac number, because 6665722515 - 2¹² = 6665718419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27109 + ... + 118601.

It is an arithmetic number, because the mean of its divisors is an integer number (481715910).

Almost surely, 2^6665722515 is an apocalyptic number.

6665722515 is a deficient number, since it is larger than the sum of its proper divisors (4895459325).

6665722515 is a wasteful number, since it uses less digits than its factorization.

6665722515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93123 (or 93120 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 6665722515 is about 81643.8761634943. The cubic root of 6665722515 is about 1881.9832054939.

The spelling of 6665722515 in words is "six billion, six hundred sixty-five million, seven hundred twenty-two thousand, five hundred fifteen".