1387762775257 has 2 divisors, whose sum is σ = 1387762775258. Its totient is φ = 1387762775256.

The previous prime is 1387762775239. The next prime is 1387762775261. The reversal of 1387762775257 is 7525772677831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1369978952521 + 17783822736 = 1170461^2 + 133356^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387762775257 - 2²³ = 1387754386649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1387762775192 and 1387762775201.

It is not a weakly prime, because it can be changed into another prime (1387762779257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693881387628 + 693881387629.

It is an arithmetic number, because the mean of its divisors is an integer number (693881387629).

Almost surely, 2^{1387762775257} is an apocalyptic number.

It is an amenable number.

1387762775257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387762775257 is an equidigital number, since it uses as much as digits as its factorization.

1387762775257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 242020800, while the sum is 67.

The spelling of 1387762775257 in words is "one trillion, three hundred eighty-seven billion, seven hundred sixty-two million, seven hundred seventy-five thousand, two hundred fifty-seven".