666502051669 has 8 divisors (see below), whose sum is σ = 701632662080. Its totient is φ = 631376596800.

The previous prime is 666502051667. The next prime is 666502051687. The reversal of 666502051669 is 966150205666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666502051669 - 2¹ = 666502051667 is a prime.

It is a super-2 number, since 2×666502051669² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666502051667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1022097 + ... + 1541974.

It is an arithmetic number, because the mean of its divisors is an integer number (87704082760).

Almost surely, 2^666502051669 is an apocalyptic number.

It is an amenable number.

666502051669 is a deficient number, since it is larger than the sum of its proper divisors (35130610411).

666502051669 is a wasteful number, since it uses less digits than its factorization.

666502051669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577771.

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 666502051669 in words is "six hundred sixty-six billion, five hundred two million, fifty-one thousand, six hundred sixty-nine".