111665001620 has 24 divisors (see below), whose sum is σ = 235477670400. Its totient is φ = 44479111712.

The previous prime is 111665001599. The next prime is 111665001641. The reversal of 111665001620 is 26100566111.

It is an interprime number because it is at equal distance from previous prime (111665001599) and next prime (111665001641).

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, 11675660 + ... + 11685219.

It is an arithmetic number, because the mean of its divisors is an integer number (9811569600).

Almost surely, 2^111665001620 is an apocalyptic number.

111665001620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111665001620 is an abundant number, since it is smaller than the sum of its proper divisors (123812668780).

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

111665001620 is a wasteful number, since it uses less digits than its factorization.

111665001620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23361127 (or 23361125 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 111665001620 its reverse (26100566111), we get a palindrome (137765567731).

The spelling of 111665001620 in words is "one hundred eleven billion, six hundred sixty-five million, one thousand, six hundred twenty".