121522011666 has 64 divisors (see below), whose sum is σ = 267746228352. Its totient is φ = 36767544000.

The previous prime is 121522011613. The next prime is 121522011701. The reversal of 121522011666 is 666110225121.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5267236 + ... + 5290256.

It is an arithmetic number, because the mean of its divisors is an integer number (4183534818).

Almost surely, 2^121522011666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121522011666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133873114176).

121522011666 is an abundant number, since it is smaller than the sum of its proper divisors (146224216686).

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

121522011666 is a wasteful number, since it uses less digits than its factorization.

121522011666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23720 (or 23698 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

Adding to 121522011666 its reverse (666110225121), we get a palindrome (787632236787).

The spelling of 121522011666 in words is "one hundred twenty-one billion, five hundred twenty-two million, eleven thousand, six hundred sixty-six".