1265665086 has 48 divisors (see below), whose sum is σ = 3235135488. Its totient is φ = 349952400.

The previous prime is 1265665043. The next prime is 1265665127. The reversal of 1265665086 is 6805665621.

It is a happy number.

1265665086 is a `hidden beast` number, since 1 + 2 + 6 + 566 + 5 + 0 + 86 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158110 + ... + 165921.

It is an arithmetic number, because the mean of its divisors is an integer number (67398656).

Almost surely, 2^1265665086 is an apocalyptic number.

1265665086 is an abundant number, since it is smaller than the sum of its proper divisors (1969470402).

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

1265665086 is a wasteful number, since it uses less digits than its factorization.

1265665086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324077 (or 324074 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 1265665086 is about 35576.1870638212. The cubic root of 1265665086 is about 1081.6985976626.

The spelling of 1265665086 in words is "one billion, two hundred sixty-five million, six hundred sixty-five thousand, eighty-six".