1265660616 has 64 divisors (see below), whose sum is σ = 3461325120. Its totient is φ = 382475520.

The previous prime is 1265660597. The next prime is 1265660633. The reversal of 1265660616 is 6160665621.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92046 + ... + 104898.

It is an arithmetic number, because the mean of its divisors is an integer number (54083205).

Almost surely, 2^1265660616 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 1265660616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1730662560).

1265660616 is an abundant number, since it is smaller than the sum of its proper divisors (2195664504).

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

1265660616 is a wasteful number, since it uses less digits than its factorization.

1265660616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13246 (or 13242 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1265660616 is about 35576.1242408444. The cubic root of 1265660616 is about 1081.6973242350.

The spelling of 1265660616 in words is "one billion, two hundred sixty-five million, six hundred sixty thousand, six hundred sixteen".