1265040180 has 60 divisors (see below), whose sum is σ = 3968482980. Its totient is φ = 337343616.

The previous prime is 1265040167. The next prime is 1265040187. The reversal of 1265040180 is 810405621.

1265040180 is a `hidden beast` number, since 1 + 2 + 650 + 4 + 0 + 1 + 8 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 322058916 + 942981264 = 17946^2 + 30708^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265040187) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 388825 + ... + 392064.

It is an arithmetic number, because the mean of its divisors is an integer number (66141383).

Almost surely, 2^1265040180 is an apocalyptic number.

1265040180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265040180 is an abundant number, since it is smaller than the sum of its proper divisors (2703442800).

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

1265040180 is a wasteful number, since it uses less digits than its factorization.

1265040180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780910 (or 780899 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1265040180 is about 35567.4033350763. The cubic root of 1265040180 is about 1081.5205433914.

The spelling of 1265040180 in words is "one billion, two hundred sixty-five million, forty thousand, one hundred eighty".