253821793365505 has 8 divisors (see below), whose sum is σ = 304757556749352. Its totient is φ = 202943164885248.

The previous prime is 253821793365493. The next prime is 253821793365559. The reversal of 253821793365505 is 505563397128352.

It can be written as a sum of positive squares in 4 ways, for example, as 77741393483664 + 176080399881841 = 8817108^2 + 13269529^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 253821793365505 - 2³⁷ = 253684354412033 is a prime.

It is a super-2 number, since 2×253821793365505² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14283716122 + ... + 14283733891.

It is an arithmetic number, because the mean of its divisors is an integer number (38094694593669).

Almost surely, 2^{253821793365505} is an apocalyptic number.

It is an amenable number.

253821793365505 is a deficient number, since it is larger than the sum of its proper divisors (50935763383847).

253821793365505 is a wasteful number, since it uses less digits than its factorization.

253821793365505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28567451795.

The product of its (nonzero) digits is 204120000, while the sum is 64.

The spelling of 253821793365505 in words is "two hundred fifty-three trillion, eight hundred twenty-one billion, seven hundred ninety-three million, three hundred sixty-five thousand, five hundred five".