1257001381881 has 24 divisors (see below), whose sum is σ = 2076798170304. Its totient is φ = 717681333600.

The previous prime is 1257001381861. The next prime is 1257001381957. The reversal of 1257001381881 is 1881831007521.

1257001381881 is a `hidden beast` number, since 125 + 70 + 0 + 1 + 381 + 8 + 81 = 666.

It is not a de Polignac number, because 1257001381881 - 2⁶ = 1257001381817 is a prime.

It is a super-2 number, since 2×1257001381881² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1257001381841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8329770 + ... + 8479331.

It is an arithmetic number, because the mean of its divisors is an integer number (86533257096).

Almost surely, 2^{1257001381881} is an apocalyptic number.

It is an amenable number.

1257001381881 is a deficient number, since it is larger than the sum of its proper divisors (819796788423).

1257001381881 is a wasteful number, since it uses less digits than its factorization.

1257001381881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16810301 (or 16810298 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 45.

The spelling of 1257001381881 in words is "one trillion, two hundred fifty-seven billion, one million, three hundred eighty-one thousand, eight hundred eighty-one".