6665565561501 has 64 divisors (see below), whose sum is σ = 12349695006720. Its totient is φ = 3087423682560.

The previous prime is 6665565561469. The next prime is 6665565561533. The reversal of 6665565561501 is 1051655655666.

It is an interprime number because it is at equal distance from previous prime (6665565561469) and next prime (6665565561533).

It is not a de Polignac number, because 6665565561501 - 2⁵ = 6665565561469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665565561601) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44592976 + ... + 44742201.

It is an arithmetic number, because the mean of its divisors is an integer number (192963984480).

Almost surely, 2^{6665565561501} is an apocalyptic number.

It is an amenable number.

6665565561501 is a deficient number, since it is larger than the sum of its proper divisors (5684129445219).

6665565561501 is a wasteful number, since it uses less digits than its factorization.

6665565561501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89335234.

The product of its (nonzero) digits is 24300000, while the sum is 57.

The spelling of 6665565561501 in words is "six trillion, six hundred sixty-five billion, five hundred sixty-five million, five hundred sixty-one thousand, five hundred one".