136857468887 has 4 divisors (see below), whose sum is σ = 136912946616. Its totient is φ = 136801991160.

The previous prime is 136857468857. The next prime is 136857468889. The reversal of 136857468887 is 788864758631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788864758631 = 5563 ⋅141805637.

It is a cyclic number.

It is not a de Polignac number, because 136857468887 - 2⁶ = 136857468823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136857468887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136857468889) 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, 27735164 + ... + 27740097.

It is an arithmetic number, because the mean of its divisors is an integer number (34228236654).

Almost surely, 2^136857468887 is an apocalyptic number.

136857468887 is a deficient number, since it is larger than the sum of its proper divisors (55477729).

136857468887 is an equidigital number, since it uses as much as digits as its factorization.

136857468887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55477728.

The product of its digits is 433520640, while the sum is 71.

The spelling of 136857468887 in words is "one hundred thirty-six billion, eight hundred fifty-seven million, four hundred sixty-eight thousand, eight hundred eighty-seven".