1256523041157 has 4 divisors (see below), whose sum is σ = 1675364054880. Its totient is φ = 837682027436.

The previous prime is 1256523041149. The next prime is 1256523041161. The reversal of 1256523041157 is 7511403256521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1256523041157 - 2³ = 1256523041149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256523041167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209420506857 + ... + 209420506862.

It is an arithmetic number, because the mean of its divisors is an integer number (418841013720).

Almost surely, 2^{1256523041157} is an apocalyptic number.

It is an amenable number.

1256523041157 is a deficient number, since it is larger than the sum of its proper divisors (418841013723).

1256523041157 is an equidigital number, since it uses as much as digits as its factorization.

1256523041157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418841013722.

The product of its (nonzero) digits is 252000, while the sum is 42.

Adding to 1256523041157 its reverse (7511403256521), we get a palindrome (8767926297678).

The spelling of 1256523041157 in words is "one trillion, two hundred fifty-six billion, five hundred twenty-three million, forty-one thousand, one hundred fifty-seven".