1251963660 has 48 divisors (see below), whose sum is σ = 3518575200. Its totient is φ = 332611584.

The previous prime is 1251963649. The next prime is 1251963679. The reversal of 1251963660 is 663691521.

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, 22645 + ... + 54924.

It is an arithmetic number, because the mean of its divisors is an integer number (73303650).

Almost surely, 2^1251963660 is an apocalyptic number.

1251963660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251963660 is an abundant number, since it is smaller than the sum of its proper divisors (2266611540).

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

1251963660 is a wasteful number, since it uses less digits than its factorization.

1251963660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77850 (or 77848 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 1251963660 is about 35383.0985076208. The cubic root of 1251963660 is about 1077.7811268618.

The spelling of 1251963660 in words is "one billion, two hundred fifty-one million, nine hundred sixty-three thousand, six hundred sixty".