204154653051621 has 12 divisors (see below), whose sum is σ = 310410583587520. Its totient is φ = 128939780874600.

The previous prime is 204154653051589. The next prime is 204154653051721. The reversal of 204154653051621 is 126150356451402.

204154653051621 is a `hidden beast` number, since 2 + 0 + 4 + 1 + 5 + 4 + 6 + 530 + 51 + 62 + 1 = 666.

It is not a de Polignac number, because 204154653051621 - 2⁵ = 204154653051589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204154653051521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 596943429805 + ... + 596943430146.

Almost surely, 2^{204154653051621} is an apocalyptic number.

It is an amenable number.

204154653051621 is a deficient number, since it is larger than the sum of its proper divisors (106255930535899).

204154653051621 is a wasteful number, since it uses less digits than its factorization.

204154653051621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193886859976 (or 1193886859973 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 204154653051621 in words is "two hundred four trillion, one hundred fifty-four billion, six hundred fifty-three million, fifty-one thousand, six hundred twenty-one".