1265481630 has 160 divisors (see below), whose sum is σ = 3906878976. Its totient is φ = 287914176.

The previous prime is 1265481599. The next prime is 1265481631. The reversal of 1265481630 is 361845621.

It is a happy number.

1265481630 is a `hidden beast` number, since 12 + 6 + 5 + 4 + 8 + 1 + 630 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265481631) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1740327 + ... + 1741053.

Almost surely, 2^1265481630 is an apocalyptic number.

1265481630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265481630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1953439488).

1265481630 is an abundant number, since it is smaller than the sum of its proper divisors (2641397346).

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

1265481630 is a wasteful number, since it uses less digits than its factorization.

1265481630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060 (or 1051 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1265481630 is about 35573.6086165011. The cubic root of 1265481630 is about 1081.6463316803.

The spelling of 1265481630 in words is "one billion, two hundred sixty-five million, four hundred eighty-one thousand, six hundred thirty".