1257155952447 has 16 divisors (see below), whose sum is σ = 1684042621952. Its totient is φ = 834194972160.

The previous prime is 1257155952439. The next prime is 1257155952487. The reversal of 1257155952447 is 7442595517521.

It is not a de Polignac number, because 1257155952447 - 2³ = 1257155952439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257155952427) 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, 440098 + ... + 1645599.

It is an arithmetic number, because the mean of its divisors is an integer number (105252663872).

Almost surely, 2^{1257155952447} is an apocalyptic number.

1257155952447 is a deficient number, since it is larger than the sum of its proper divisors (426886669505).

1257155952447 is a wasteful number, since it uses less digits than its factorization.

1257155952447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086638.

The product of its digits is 17640000, while the sum is 57.

The spelling of 1257155952447 in words is "one trillion, two hundred fifty-seven billion, one hundred fifty-five million, nine hundred fifty-two thousand, four hundred forty-seven".