1257428901715 has 8 divisors (see below), whose sum is σ = 1724473922400. Its totient is φ = 862236961152.

The previous prime is 1257428901713. The next prime is 1257428901719. The reversal of 1257428901715 is 5171098247521.

It is a happy number.

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

It is not a de Polignac number, because 1257428901715 - 2¹ = 1257428901713 is a prime.

It is a super-2 number, since 2×1257428901715² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1257428901713) 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, 17963269990 + ... + 17963270059.

It is an arithmetic number, because the mean of its divisors is an integer number (215559240300).

Almost surely, 2^{1257428901715} is an apocalyptic number.

1257428901715 is a deficient number, since it is larger than the sum of its proper divisors (467045020685).

1257428901715 is an equidigital number, since it uses as much as digits as its factorization.

1257428901715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35926540061.

The product of its (nonzero) digits is 1411200, while the sum is 52.

The spelling of 1257428901715 in words is "one trillion, two hundred fifty-seven billion, four hundred twenty-eight million, nine hundred one thousand, seven hundred fifteen".