664169499 has 48 divisors (see below), whose sum is σ = 1130272000. Its totient is φ = 367882560.

The previous prime is 664169497. The next prime is 664169501. The reversal of 664169499 is 994961466.

It is an interprime number because it is at equal distance from previous prime (664169497) and next prime (664169501).

It is not a de Polignac number, because 664169499 - 2¹ = 664169497 is a prime.

It is a super-2 number, since 2×664169499² = 882242246803822002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664169497) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1162884 + ... + 1163454.

Almost surely, 2^664169499 is an apocalyptic number.

664169499 is a deficient number, since it is larger than the sum of its proper divisors (466102501).

664169499 is a wasteful number, since it uses less digits than its factorization.

664169499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120 (or 1117 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 664169499 is about 25771.4861620357. The cubic root of 664169499 is about 872.4883615714.

The spelling of 664169499 in words is "six hundred sixty-four million, one hundred sixty-nine thousand, four hundred ninety-nine".