666020143220015 has 64 divisors (see below), whose sum is σ = 847347678277632. Its totient is φ = 501505248921600.

The previous prime is 666020143219919. The next prime is 666020143220021. The reversal of 666020143220015 is 510022341020666.

It is not a de Polignac number, because 666020143220015 - 2⁸ = 666020143219759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10780308425 + ... + 10780370205.

It is an arithmetic number, because the mean of its divisors is an integer number (13239807473088).

Almost surely, 2^{666020143220015} is an apocalyptic number.

666020143220015 is a deficient number, since it is larger than the sum of its proper divisors (181327535057617).

666020143220015 is a wasteful number, since it uses less digits than its factorization.

666020143220015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64400.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 666020143220015 in words is "six hundred sixty-six trillion, twenty billion, one hundred forty-three million, two hundred twenty thousand, fifteen".