11887693657 has 8 divisors (see below), whose sum is σ = 13863200000. Its totient is φ = 10189451412.

The previous prime is 11887693639. The next prime is 11887693661. The reversal of 11887693657 is 75639678811.

It is not a de Polignac number, because 11887693657 - 2²³ = 11879305049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11887693595 and 11887693604.

It is not an unprimeable number, because it can be changed into a prime (11887693607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17328657 + ... + 17329342.

It is an arithmetic number, because the mean of its divisors is an integer number (1732900000).

Almost surely, 2^11887693657 is an apocalyptic number.

It is an amenable number.

11887693657 is a deficient number, since it is larger than the sum of its proper divisors (1975506343).

11887693657 is an frugal number, since it uses more digits than its factorization.

11887693657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34658020 (or 34658006 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 61.

The spelling of 11887693657 in words is "eleven billion, eight hundred eighty-seven million, six hundred ninety-three thousand, six hundred fifty-seven".