1251400265140 has 24 divisors (see below), whose sum is σ = 2742198842880. Its totient is φ = 478796623008.

The previous prime is 1251400265123. The next prime is 1251400265153. The reversal of 1251400265140 is 415620041521.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1360217220 + ... + 1360218139.

It is an arithmetic number, because the mean of its divisors is an integer number (114258285120).

Almost surely, 2^{1251400265140} is an apocalyptic number.

1251400265140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251400265140 is an abundant number, since it is smaller than the sum of its proper divisors (1490798577740).

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

1251400265140 is a wasteful number, since it uses less digits than its factorization.

1251400265140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720435391 (or 2720435389 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 1251400265140 in words is "one trillion, two hundred fifty-one billion, four hundred million, two hundred sixty-five thousand, one hundred forty".