1253257375721 has 8 divisors (see below), whose sum is σ = 1351961050944. Its totient is φ = 1154882166480.

The previous prime is 1253257375703. The next prime is 1253257375729. The reversal of 1253257375721 is 1275737523521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1253257375721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1253257375721.

It is not an unprimeable number, because it can be changed into a prime (1253257375729) 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, 82108565 + ... + 82123826.

It is an arithmetic number, because the mean of its divisors is an integer number (168995131368).

Almost surely, 2^{1253257375721} is an apocalyptic number.

It is an amenable number.

1253257375721 is a deficient number, since it is larger than the sum of its proper divisors (98703675223).

1253257375721 is a wasteful number, since it uses less digits than its factorization.

1253257375721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164232991.

The product of its digits is 3087000, while the sum is 50.

The spelling of 1253257375721 in words is "one trillion, two hundred fifty-three billion, two hundred fifty-seven million, three hundred seventy-five thousand, seven hundred twenty-one".