1257778768897 has 16 divisors (see below), whose sum is σ = 1476730697472. Its totient is φ = 1048660689600.

The previous prime is 1257778768889. The next prime is 1257778768927. The reversal of 1257778768897 is 7988678777521.

It is not a de Polignac number, because 1257778768897 - 2³ = 1257778768889 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 1257778768897.

It is not an unprimeable number, because it can be changed into a prime (1257778768097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227772 + ... + 1602322.

It is an arithmetic number, because the mean of its divisors is an integer number (92295668592).

Almost surely, 2^{1257778768897} is an apocalyptic number.

It is an amenable number.

1257778768897 is a deficient number, since it is larger than the sum of its proper divisors (218951928575).

1257778768897 is a wasteful number, since it uses less digits than its factorization.

1257778768897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378128.

The product of its digits is 4646799360, while the sum is 82.

The spelling of 1257778768897 in words is "one trillion, two hundred fifty-seven billion, seven hundred seventy-eight million, seven hundred sixty-eight thousand, eight hundred ninety-seven".