666985014551 has 8 divisors (see below), whose sum is σ = 668041363584. Its totient is φ = 665929473120.

The previous prime is 666985014547. The next prime is 666985014599. The reversal of 666985014551 is 155410589666.

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

It is a cyclic number.

It is not a de Polignac number, because 666985014551 - 2² = 666985014547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666985014541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462001 + ... + 1863173.

It is an arithmetic number, because the mean of its divisors is an integer number (83505170448).

Almost surely, 2^666985014551 is an apocalyptic number.

666985014551 is a deficient number, since it is larger than the sum of its proper divisors (1056349033).

666985014551 is a wasteful number, since it uses less digits than its factorization.

666985014551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403801.

The product of its (nonzero) digits is 7776000, while the sum is 56.

The spelling of 666985014551 in words is "six hundred sixty-six billion, nine hundred eighty-five million, fourteen thousand, five hundred fifty-one".