66312669 has 8 divisors (see below), whose sum is σ = 89113600. Its totient is φ = 43860096.

The previous prime is 66312667. The next prime is 66312671. The reversal of 66312669 is 96621366.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66312667) and next prime (66312671).

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

It is not a de Polignac number, because 66312669 - 2¹ = 66312667 is a prime.

It is a super-2 number, since 2×66312669² = 8794740139807122, which 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 (66312667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86644 + ... + 87405.

It is an arithmetic number, because the mean of its divisors is an integer number (11139200).

Almost surely, 2^66312669 is an apocalyptic number.

It is an amenable number.

66312669 is a deficient number, since it is larger than the sum of its proper divisors (22800931).

66312669 is a wasteful number, since it uses less digits than its factorization.

66312669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174179.

The product of its digits is 69984, while the sum is 39.

The square root of 66312669 is about 8143.2591141385. The cubic root of 66312669 is about 404.7611638607.

The spelling of 66312669 in words is "sixty-six million, three hundred twelve thousand, six hundred sixty-nine".