1261657375120 has 40 divisors (see below), whose sum is σ = 2941093186560. Its totient is φ = 503331373440.

The previous prime is 1261657375073. The next prime is 1261657375171. The reversal of 1261657375120 is 215737561621.

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

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, 20775376 + ... + 20836015.

It is an arithmetic number, because the mean of its divisors is an integer number (73527329664).

Almost surely, 2^{1261657375120} is an apocalyptic number.

1261657375120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261657375120 is an abundant number, since it is smaller than the sum of its proper divisors (1679435811440).

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

1261657375120 is a wasteful number, since it uses less digits than its factorization.

1261657375120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41611783 (or 41611777 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 1261657375120 in words is "one trillion, two hundred sixty-one billion, six hundred fifty-seven million, three hundred seventy-five thousand, one hundred twenty".