653664375 has 120 divisors (see below), whose sum is σ = 1453259808. Its totient is φ = 275616000.

The previous prime is 653664329. The next prime is 653664377. The reversal of 653664375 is 573466356.

653664375 is a `hidden beast` number, since 6 + 536 + 6 + 43 + 75 = 666.

It is not a de Polignac number, because 653664375 - 2⁷ = 653664247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 653664375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653664377) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 511237 + ... + 512513.

Almost surely, 2^653664375 is an apocalyptic number.

653664375 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

653664375 is an abundant number, since it is smaller than the sum of its proper divisors (799595433).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

653664375 is a wasteful number, since it uses less digits than its factorization.

653664375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1305 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 45.

The square root of 653664375 is about 25566.8608749686. The cubic root of 653664375 is about 867.8638636157.

The spelling of 653664375 in words is "six hundred fifty-three million, six hundred sixty-four thousand, three hundred seventy-five".