667248621 has 16 divisors (see below), whose sum is σ = 961758336. Its totient is φ = 409046976.

The previous prime is 667248599. The next prime is 667248643. The reversal of 667248621 is 126842766.

It is an interprime number because it is at equal distance from previous prime (667248599) and next prime (667248643).

It is a de Polignac number, because none of the positive numbers 2^k-667248621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667248721) 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 15 ways as a sum of consecutive naturals, for example, 22270 + ... + 42783.

It is an arithmetic number, because the mean of its divisors is an integer number (60109896).

Almost surely, 2^667248621 is an apocalyptic number.

It is an amenable number.

667248621 is a deficient number, since it is larger than the sum of its proper divisors (294509715).

667248621 is a wasteful number, since it uses less digits than its factorization.

667248621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65332.

The product of its digits is 193536, while the sum is 42.

The square root of 667248621 is about 25831.1560136205. The cubic root of 667248621 is about 873.8345827766.

Multiplying 667248621 by its sum of digits (42), we get a palindrome (28024442082).

The spelling of 667248621 in words is "six hundred sixty-seven million, two hundred forty-eight thousand, six hundred twenty-one".