251655556153 has 16 divisors (see below), whose sum is σ = 268810920000. Its totient is φ = 234767066112.

The previous prime is 251655556147. The next prime is 251655556193. The reversal of 251655556153 is 351655556152.

It is a cyclic number.

It is not a de Polignac number, because 251655556153 - 2¹³ = 251655547961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251655556097 and 251655556106.

It is not an unprimeable number, because it can be changed into a prime (251655556123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1376673 + ... + 1548721.

It is an arithmetic number, because the mean of its divisors is an integer number (16800682500).

Almost surely, 2^251655556153 is an apocalyptic number.

It is an amenable number.

251655556153 is a deficient number, since it is larger than the sum of its proper divisors (17155363847).

251655556153 is a wasteful number, since it uses less digits than its factorization.

251655556153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172824.

The product of its digits is 3375000, while the sum is 49.

Subtracting 251655556153 from its reverse (351655556152), we obtain a palindrome (99999999999).

The spelling of 251655556153 in words is "two hundred fifty-one billion, six hundred fifty-five million, five hundred fifty-six thousand, one hundred fifty-three".