645455022121 has 8 divisors (see below), whose sum is σ = 794406181184. Its totient is φ = 510689687760.

The previous prime is 645455022103. The next prime is 645455022167. The reversal of 645455022121 is 121220554546.

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

It is not a de Polignac number, because 645455022121 - 2⁵ = 645455022089 is a prime.

It is a super-2 number, since 2×645455022121² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645455022521) 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, 3546456075 + ... + 3546456256.

It is an arithmetic number, because the mean of its divisors is an integer number (99300772648).

Almost surely, 2^645455022121 is an apocalyptic number.

It is an amenable number.

645455022121 is a deficient number, since it is larger than the sum of its proper divisors (148951159063).

645455022121 is a wasteful number, since it uses less digits than its factorization.

645455022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7092912351.

The product of its (nonzero) digits is 96000, while the sum is 37.

Adding to 645455022121 its reverse (121220554546), we get a palindrome (766675576667).

The spelling of 645455022121 in words is "six hundred forty-five billion, four hundred fifty-five million, twenty-two thousand, one hundred twenty-one".