253684220402 has 18 divisors (see below), whose sum is σ = 394132489959. Its totient is φ = 122458272160.

The previous prime is 253684220389. The next prime is 253684220443. The reversal of 253684220402 is 204022486352.

It can be written as a sum of positive squares in 5 ways, for example, as 225701956561 + 27982263841 = 475081^2 + 167279^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=356149.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20650502 + ... + 20662782.

Almost surely, 2^253684220402 is an apocalyptic number.

253684220402 is a deficient number, since it is larger than the sum of its proper divisors (140448269557).

253684220402 is an frugal number, since it uses more digits than its factorization.

253684220402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24622 (or 12312 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 38.

The spelling of 253684220402 in words is "two hundred fifty-three billion, six hundred eighty-four million, two hundred twenty thousand, four hundred two".