1257361807855 has 16 divisors (see below), whose sum is σ = 1520679138624. Its totient is φ = 998000835840.

The previous prime is 1257361807837. The next prime is 1257361807873. The reversal of 1257361807855 is 5587081637521.

It is an interprime number because it is at equal distance from previous prime (1257361807837) and next prime (1257361807873).

It is not a de Polignac number, because 1257361807855 - 2⁷ = 1257361807727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1257361807855.

It is a congruent number.

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, 752989 + ... + 1755481.

It is an arithmetic number, because the mean of its divisors is an integer number (95042446164).

Almost surely, 2^{1257361807855} is an apocalyptic number.

1257361807855 is a deficient number, since it is larger than the sum of its proper divisors (263317330769).

1257361807855 is a wasteful number, since it uses less digits than its factorization.

1257361807855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004466.

The product of its (nonzero) digits is 14112000, while the sum is 58.

The spelling of 1257361807855 in words is "one trillion, two hundred fifty-seven billion, three hundred sixty-one million, eight hundred seven thousand, eight hundred fifty-five".