1664736255 has 96 divisors (see below), whose sum is σ = 3569319936. Its totient is φ = 698948352.

The previous prime is 1664736253. The next prime is 1664736259. The reversal of 1664736255 is 5526374661.

1664736255 is a `hidden beast` number, since 16 + 6 + 4 + 7 + 3 + 625 + 5 = 666.

It is not a de Polignac number, because 1664736255 - 2¹ = 1664736253 is a prime.

It is a super-2 number, since 2×1664736255² = 5542693597422850050, which contains 22 as substring.

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 1664736255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664736253) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 912274 + ... + 914096.

It is an arithmetic number, because the mean of its divisors is an integer number (37180416).

Almost surely, 2^1664736255 is an apocalyptic number.

1664736255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1664736255 is an abundant number, since it is smaller than the sum of its proper divisors (1904583681).

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

1664736255 is a wasteful number, since it uses less digits than its factorization.

1664736255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077 (or 2074 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 1664736255 is about 40801.1795785367. The cubic root of 1664736255 is about 1185.1731734311.

The spelling of 1664736255 in words is "one billion, six hundred sixty-four million, seven hundred thirty-six thousand, two hundred fifty-five".