1257775633172 has 12 divisors (see below), whose sum is σ = 2204015034900. Its totient is φ = 628057051776.

The previous prime is 1257775633157. The next prime is 1257775633187. The reversal of 1257775633172 is 2713365777521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1257775633157) and next prime (1257775633187).

It can be written as a sum of positive squares in 2 ways, for example, as 1115740113796 + 142035519376 = 1056286^2 + 376876^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207687797 + ... + 207693852.

It is an arithmetic number, because the mean of its divisors is an integer number (183667919575).

Almost surely, 2^{1257775633172} is an apocalyptic number.

It is an amenable number.

1257775633172 is a deficient number, since it is larger than the sum of its proper divisors (946239401728).

1257775633172 is a wasteful number, since it uses less digits than its factorization.

1257775633172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415382410 (or 415382408 counting only the distinct ones).

The product of its digits is 12965400, while the sum is 56.

The spelling of 1257775633172 in words is "one trillion, two hundred fifty-seven billion, seven hundred seventy-five million, six hundred thirty-three thousand, one hundred seventy-two".