66312739 has 8 divisors (see below), whose sum is σ = 67139072. Its totient is φ = 65490120.

The previous prime is 66312713. The next prime is 66312773. The reversal of 66312739 is 93721366.

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 66312739 - 2¹⁵ = 66279971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66312698 and 66312707.

It is not an unprimeable number, because it can be changed into a prime (66312839) 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, 53254 + ... + 54484.

It is an arithmetic number, because the mean of its divisors is an integer number (8392384).

Almost surely, 2^66312739 is an apocalyptic number.

66312739 is a deficient number, since it is larger than the sum of its proper divisors (826333).

66312739 is a wasteful number, since it uses less digits than its factorization.

66312739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857.

The product of its digits is 40824, while the sum is 37.

The square root of 66312739 is about 8143.2634121708. The cubic root of 66312739 is about 404.7613062833.

The spelling of 66312739 in words is "sixty-six million, three hundred twelve thousand, seven hundred thirty-nine".