1275657265640 has 32 divisors (see below), whose sum is σ = 2897053426080. Its totient is φ = 505494092352.

The previous prime is 1275657265621. The next prime is 1275657265643. The reversal of 1275657265640 is 465627565721.

It is not an unprimeable number, because it can be changed into a prime (1275657265643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149021102 + ... + 149029661.

It is an arithmetic number, because the mean of its divisors is an integer number (90532919565).

Almost surely, 2^{1275657265640} is an apocalyptic number.

1275657265640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275657265640 is an abundant number, since it is smaller than the sum of its proper divisors (1621396160440).

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

1275657265640 is a wasteful number, since it uses less digits than its factorization.

1275657265640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298050881 (or 298050877 counting only the distinct ones).

The product of its (nonzero) digits is 21168000, while the sum is 56.

The spelling of 1275657265640 in words is "one trillion, two hundred seventy-five billion, six hundred fifty-seven million, two hundred sixty-five thousand, six hundred forty".