121550011660 has 96 divisors (see below), whose sum is σ = 321056773632. Its totient is φ = 37550392320.

The previous prime is 121550011657. The next prime is 121550011699. The reversal of 121550011660 is 66110055121.

It is a happy number.

It is a super-3 number, since 3×121550011660³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 175222 + ... + 523261.

It is an arithmetic number, because the mean of its divisors is an integer number (3344341392).

Almost surely, 2^121550011660 is an apocalyptic number.

121550011660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121550011660 is an abundant number, since it is smaller than the sum of its proper divisors (199506761972).

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

121550011660 is a wasteful number, since it uses less digits than its factorization.

121550011660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698623 (or 698621 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 121550011660 its reverse (66110055121), we get a palindrome (187660066781).

The spelling of 121550011660 in words is "one hundred twenty-one billion, five hundred fifty million, eleven thousand, six hundred sixty".