1265660604 has 108 divisors (see below), whose sum is σ = 3647007000. Its totient is φ = 368903808.

The previous prime is 1265660597. The next prime is 1265660633. The reversal of 1265660604 is 4060665621.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 110122 + ... + 121070.

Almost surely, 2^1265660604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265660604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1823503500).

1265660604 is an abundant number, since it is smaller than the sum of its proper divisors (2381346396).

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

1265660604 is a wasteful number, since it uses less digits than its factorization.

1265660604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11004 (or 10986 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1265660604 is about 35576.1240721920. The cubic root of 1265660604 is about 1081.6973208164.

The spelling of 1265660604 in words is "one billion, two hundred sixty-five million, six hundred sixty thousand, six hundred four".