136257523257 has 4 divisors (see below), whose sum is σ = 181676697680. Its totient is φ = 90838348836.

The previous prime is 136257523247. The next prime is 136257523261. The reversal of 136257523257 is 752325752631.

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 not a de Polignac number, because 136257523257 - 2³² = 131962555961 is a prime.

It is a super-2 number, since 2×136257523257² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136257523217) 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, 22709587207 + ... + 22709587212.

It is an arithmetic number, because the mean of its divisors is an integer number (45419174420).

Almost surely, 2^136257523257 is an apocalyptic number.

It is an amenable number.

136257523257 is a deficient number, since it is larger than the sum of its proper divisors (45419174423).

136257523257 is an equidigital number, since it uses as much as digits as its factorization.

136257523257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45419174422.

The product of its digits is 2646000, while the sum is 48.

The spelling of 136257523257 in words is "one hundred thirty-six billion, two hundred fifty-seven million, five hundred twenty-three thousand, two hundred fifty-seven".