254671201661 has 4 divisors (see below), whose sum is σ = 254673610524. Its totient is φ = 254668792800.

The previous prime is 254671201639. The next prime is 254671201669. The reversal of 254671201661 is 166102176452.

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

It can be written as a sum of positive squares in 2 ways, for example, as 108273902500 + 146397299161 = 329050^2 + 382619^2 .

It is a cyclic number.

It is not a de Polignac number, because 254671201661 - 2¹⁴ = 254671185277 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 (254671201669) 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, 1038200 + ... + 1259841.

It is an arithmetic number, because the mean of its divisors is an integer number (63668402631).

Almost surely, 2^254671201661 is an apocalyptic number.

It is an amenable number.

254671201661 is a deficient number, since it is larger than the sum of its proper divisors (2408863).

254671201661 is a wasteful number, since it uses less digits than its factorization.

254671201661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408862.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 254671201661 in words is "two hundred fifty-four billion, six hundred seventy-one million, two hundred one thousand, six hundred sixty-one".