11657747820 has 48 divisors (see below), whose sum is σ = 33176814048. Its totient is φ = 3057768960.

The previous prime is 11657747797. The next prime is 11657747831. The reversal of 11657747820 is 2874775611.

It is a self number, because there is not a number n which added to its sum of digits gives 11657747820.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1588929 + ... + 1596248.

It is an arithmetic number, because the mean of its divisors is an integer number (691183626).

Almost surely, 2^11657747820 is an apocalyptic number.

11657747820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11657747820 is an abundant number, since it is smaller than the sum of its proper divisors (21519066228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11657747820 is a wasteful number, since it uses less digits than its factorization.

11657747820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185250 (or 3185248 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 48.

The spelling of 11657747820 in words is "eleven billion, six hundred fifty-seven million, seven hundred forty-seven thousand, eight hundred twenty".