11661820016 has 40 divisors (see below), whose sum is σ = 28170113664. Its totient is φ = 4543565760.

The previous prime is 11661820003. The next prime is 11661820063. The reversal of 11661820016 is 61002816611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4731650 + ... + 4734113.

Almost surely, 2^11661820016 is an apocalyptic number.

11661820016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11661820016 is an abundant number, since it is smaller than the sum of its proper divisors (16508293648).

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

11661820016 is a wasteful number, since it uses less digits than its factorization.

11661820016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9465789 (or 9465783 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The spelling of 11661820016 in words is "eleven billion, six hundred sixty-one million, eight hundred twenty thousand, sixteen".