666137995 has 8 divisors (see below), whose sum is σ = 812470320. Its totient is φ = 524173920.

The previous prime is 666137981. The next prime is 666137999. The reversal of 666137995 is 599731666.

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

It is not a de Polignac number, because 666137995 - 2⁵ = 666137963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666137999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1091725 + ... + 1092334.

It is an arithmetic number, because the mean of its divisors is an integer number (101558790).

Almost surely, 2^666137995 is an apocalyptic number.

666137995 is a deficient number, since it is larger than the sum of its proper divisors (146332325).

666137995 is a wasteful number, since it uses less digits than its factorization.

666137995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184125.

The product of its digits is 1837080, while the sum is 52.

The square root of 666137995 is about 25809.6492614681. The cubic root of 666137995 is about 873.3494850492.

The spelling of 666137995 in words is "six hundred sixty-six million, one hundred thirty-seven thousand, nine hundred ninety-five".