664262421 has 8 divisors (see below), whose sum is σ = 904527744. Its totient is φ = 433419360.

The previous prime is 664262419. The next prime is 664262449. The reversal of 664262421 is 124262466.

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

It is not a de Polignac number, because 664262421 - 2¹ = 664262419 is a prime.

It is a super-3 number, since 3×664262421³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664262461) 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, 2355400 + ... + 2355681.

It is an arithmetic number, because the mean of its divisors is an integer number (113065968).

Almost surely, 2^664262421 is an apocalyptic number.

It is an amenable number.

664262421 is a deficient number, since it is larger than the sum of its proper divisors (240265323).

664262421 is a wasteful number, since it uses less digits than its factorization.

664262421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4711131.

The product of its digits is 27648, while the sum is 33.

The square root of 664262421 is about 25773.2889053764. The cubic root of 664262421 is about 872.5290487670.

The spelling of 664262421 in words is "six hundred sixty-four million, two hundred sixty-two thousand, four hundred twenty-one".