1265145980 has 48 divisors (see below), whose sum is σ = 3043353600. Its totient is φ = 432763968.

The previous prime is 1265145961. The next prime is 1265145997. The reversal of 1265145980 is 895415621.

It is a congruent number.

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, 51821 + ... + 72219.

It is an arithmetic number, because the mean of its divisors is an integer number (63403200).

Almost surely, 2^1265145980 is an apocalyptic number.

1265145980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265145980 is an abundant number, since it is smaller than the sum of its proper divisors (1778207620).

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

1265145980 is a wasteful number, since it uses less digits than its factorization.

1265145980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20858 (or 20856 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 1265145980 is about 35568.8906208782. The cubic root of 1265145980 is about 1081.5506930751.

The spelling of 1265145980 in words is "one billion, two hundred sixty-five million, one hundred forty-five thousand, nine hundred eighty".