1275251502640 has 40 divisors (see below), whose sum is σ = 2971391412528. Its totient is φ = 508994077440.

The previous prime is 1275251502611. The next prime is 1275251502653. The reversal of 1275251502640 is 462051525721.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1275251502593 and 1275251502602.

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, 17252322 + ... + 17326081.

Almost surely, 2^{1275251502640} is an apocalyptic number.

1275251502640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275251502640 is an abundant number, since it is smaller than the sum of its proper divisors (1696139909888).

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

1275251502640 is a wasteful number, since it uses less digits than its factorization.

1275251502640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34578877 (or 34578871 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 1275251502640 in words is "one trillion, two hundred seventy-five billion, two hundred fifty-one million, five hundred two thousand, six hundred forty".