255500121621 has 8 divisors (see below), whose sum is σ = 340771372960. Its totient is φ = 170281142352.

The previous prime is 255500121619. The next prime is 255500121629. The reversal of 255500121621 is 126121005552.

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

It is not a de Polignac number, because 255500121621 - 2¹ = 255500121619 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 (255500121629) 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, 13056610 + ... + 13076163.

It is an arithmetic number, because the mean of its divisors is an integer number (42596421620).

Almost surely, 2^255500121621 is an apocalyptic number.

It is an amenable number.

255500121621 is a deficient number, since it is larger than the sum of its proper divisors (85271251339).

255500121621 is a wasteful number, since it uses less digits than its factorization.

255500121621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26136035.

The product of its (nonzero) digits is 6000, while the sum is 30.

The spelling of 255500121621 in words is "two hundred fifty-five billion, five hundred million, one hundred twenty-one thousand, six hundred twenty-one".