121556664653 has 8 divisors (see below), whose sum is σ = 121930303872. Its totient is φ = 121183102656.

The previous prime is 121556664637. The next prime is 121556664737. The reversal of 121556664653 is 356466655121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121556664653 - 2⁴ = 121556664637 is a prime.

It is a super-2 number, since 2×121556664653² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121556664623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5646476 + ... + 5667962.

It is an arithmetic number, because the mean of its divisors is an integer number (15241287984).

Almost surely, 2^121556664653 is an apocalyptic number.

It is an amenable number.

121556664653 is a deficient number, since it is larger than the sum of its proper divisors (373639219).

121556664653 is a wasteful number, since it uses less digits than its factorization.

121556664653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38611.

The product of its digits is 3888000, while the sum is 50.

The spelling of 121556664653 in words is "one hundred twenty-one billion, five hundred fifty-six million, six hundred sixty-four thousand, six hundred fifty-three".