669015731 has 16 divisors (see below), whose sum is σ = 690729600. Its totient is φ = 647740800.

The previous prime is 669015713. The next prime is 669015749. The reversal of 669015731 is 137510966.

It is an interprime number because it is at equal distance from previous prime (669015713) and next prime (669015749).

It is a cyclic number.

It is not a de Polignac number, because 669015731 - 2⁶ = 669015667 is a prime.

It is a super-2 number, since 2×669015731² = 895164096650928722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669015791) 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 15 ways as a sum of consecutive naturals, for example, 1588901 + ... + 1589321.

It is an arithmetic number, because the mean of its divisors is an integer number (43170600).

Almost surely, 2^669015731 is an apocalyptic number.

669015731 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

669015731 is a deficient number, since it is larger than the sum of its proper divisors (21713869).

669015731 is a wasteful number, since it uses less digits than its factorization.

669015731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 669015731 is about 25865.3384087663. The cubic root of 669015731 is about 874.6053103191.

The spelling of 669015731 in words is "six hundred sixty-nine million, fifteen thousand, seven hundred thirty-one".