204255122151551 has 4 divisors (see below), whose sum is σ = 204811675618272. Its totient is φ = 203698568684832.

The previous prime is 204255122151533. The next prime is 204255122151611. The reversal of 204255122151551 is 155151221552402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204255122151551 - 2¹⁴ = 204255122135167 is a prime.

It is a super-2 number, since 2×204255122151551² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204255122151499 and 204255122151508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204255122156551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278276732810 + ... + 278276733543.

It is an arithmetic number, because the mean of its divisors is an integer number (51202918904568).

Almost surely, 2^{204255122151551} is an apocalyptic number.

204255122151551 is a deficient number, since it is larger than the sum of its proper divisors (556553466721).

204255122151551 is an equidigital number, since it uses as much as digits as its factorization.

204255122151551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556553466720.

The product of its (nonzero) digits is 200000, while the sum is 41.

The spelling of 204255122151551 in words is "two hundred four trillion, two hundred fifty-five billion, one hundred twenty-two million, one hundred fifty-one thousand, five hundred fifty-one".