1271257812660 has 96 divisors (see below), whose sum is σ = 3884491158912. Its totient is φ = 308074475520.

The previous prime is 1271257812637. The next prime is 1271257812667. The reversal of 1271257812660 is 662187521721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271257812667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1529832 + ... + 2209728.

It is an arithmetic number, because the mean of its divisors is an integer number (40463449572).

Almost surely, 2^{1271257812660} is an apocalyptic number.

1271257812660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271257812660 is an abundant number, since it is smaller than the sum of its proper divisors (2613233346252).

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

1271257812660 is a wasteful number, since it uses less digits than its factorization.

1271257812660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682753 (or 682751 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 1271257812660 in words is "one trillion, two hundred seventy-one billion, two hundred fifty-seven million, eight hundred twelve thousand, six hundred sixty".