1265204664 has 64 divisors (see below), whose sum is σ = 3564000000. Its totient is φ = 415789920.

The previous prime is 1265204653. The next prime is 1265204669. The reversal of 1265204664 is 4664025621.

1265204664 is a `hidden beast` number, since 126 + 520 + 4 + 6 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265204669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25914 + ... + 56585.

It is an arithmetic number, because the mean of its divisors is an integer number (55687500).

Almost surely, 2^1265204664 is an apocalyptic number.

It is an amenable number.

1265204664 is an abundant number, since it is smaller than the sum of its proper divisors (2298795336).

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

1265204664 is a wasteful number, since it uses less digits than its factorization.

1265204664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82585 (or 82575 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 1265204664 is about 35569.7155456717. The cubic root of 1265204664 is about 1081.5674154509.

The spelling of 1265204664 in words is "one billion, two hundred sixty-five million, two hundred four thousand, six hundred sixty-four".