1257394323272 has 8 divisors (see below), whose sum is σ = 2357614356150. Its totient is φ = 628697161632.

The previous prime is 1257394323259. The next prime is 1257394323373. The reversal of 1257394323272 is 2723234937521.

It can be written as a sum of positive squares in only one way, i.e., 971868675556 + 285525647716 = 985834^2 + 534346^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1257394323272.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78587145197 + ... + 78587145212.

Almost surely, 2^{1257394323272} is an apocalyptic number.

It is an amenable number.

1257394323272 is a deficient number, since it is larger than the sum of its proper divisors (1100220032878).

1257394323272 is a wasteful number, since it uses less digits than its factorization.

1257394323272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157174290415 (or 157174290411 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 50.

The spelling of 1257394323272 in words is "one trillion, two hundred fifty-seven billion, three hundred ninety-four million, three hundred twenty-three thousand, two hundred seventy-two".