1257891375890 has 32 divisors (see below), whose sum is σ = 2295673750656. Its totient is φ = 496203920640.

The previous prime is 1257891375877. The next prime is 1257891375907. The reversal of 1257891375890 is 985731987521.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2285492 + ... + 2781951.

It is an arithmetic number, because the mean of its divisors is an integer number (71739804708).

Almost surely, 2^{1257891375890} is an apocalyptic number.

1257891375890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1257891375890 is a deficient number, since it is larger than the sum of its proper divisors (1037782374766).

1257891375890 is a wasteful number, since it uses less digits than its factorization.

1257891375890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5067794.

The product of its (nonzero) digits is 38102400, while the sum is 65.

The spelling of 1257891375890 in words is "one trillion, two hundred fifty-seven billion, eight hundred ninety-one million, three hundred seventy-five thousand, eight hundred ninety".