1251898668 has 72 divisors (see below), whose sum is σ = 3298620416. Its totient is φ = 399880800.

The previous prime is 1251898643. The next prime is 1251898723. The reversal of 1251898668 is 8668981521.

It is a happy 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, 109503 + ... + 120393.

Almost surely, 2^1251898668 is an apocalyptic number.

1251898668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251898668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1649310208).

1251898668 is an abundant number, since it is smaller than the sum of its proper divisors (2046721748).

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

1251898668 is a wasteful number, since it uses less digits than its factorization.

1251898668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11035 (or 11030 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The square root of 1251898668 is about 35382.1800911137. The cubic root of 1251898668 is about 1077.7624765965.

The spelling of 1251898668 in words is "one billion, two hundred fifty-one million, eight hundred ninety-eight thousand, six hundred sixty-eight".