666021170754641 has 16 divisors (see below), whose sum is σ = 740397117841920. Its totient is φ = 594951784508160.

The previous prime is 666021170754581. The next prime is 666021170754647. The reversal of 666021170754641 is 146457071120666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666021170754641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666021170754647) 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, 40462886 + ... + 54491168.

It is an arithmetic number, because the mean of its divisors is an integer number (46274819865120).

Almost surely, 2^{666021170754641} is an apocalyptic number.

It is an amenable number.

666021170754641 is a deficient number, since it is larger than the sum of its proper divisors (74375947087279).

666021170754641 is a wasteful number, since it uses less digits than its factorization.

666021170754641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14146136.

The product of its (nonzero) digits is 10160640, while the sum is 56.

The spelling of 666021170754641 in words is "six hundred sixty-six trillion, twenty-one billion, one hundred seventy million, seven hundred fifty-four thousand, six hundred forty-one".