66358731 has 8 divisors (see below), whose sum is σ = 88713280. Its totient is φ = 44121672.

The previous prime is 66358729. The next prime is 66358741. The reversal of 66358731 is 13785366.

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

It is not a de Polignac number, because 66358731 - 2¹ = 66358729 is a prime.

It is a super-2 number, since 2×66358731² = 8806962359860722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66358731.

It is not an unprimeable number, because it can be changed into a prime (66358741) 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, 28045 + ... + 30318.

It is an arithmetic number, because the mean of its divisors is an integer number (11089160).

Almost surely, 2^66358731 is an apocalyptic number.

66358731 is a deficient number, since it is larger than the sum of its proper divisors (22354549).

66358731 is a wasteful number, since it uses less digits than its factorization.

66358731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58745.

The product of its digits is 90720, while the sum is 39.

The square root of 66358731 is about 8146.0868519799. The cubic root of 66358731 is about 404.8548603535.

The spelling of 66358731 in words is "sixty-six million, three hundred fifty-eight thousand, seven hundred thirty-one".