253420626643 has 4 divisors (see below), whose sum is σ = 253859831080. Its totient is φ = 252981422208.

The previous prime is 253420626617. The next prime is 253420626659. The reversal of 253420626643 is 346626024352.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253420626643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 253420626643.

It is not an unprimeable number, because it can be changed into a prime (253420626743) 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, 219601353 + ... + 219602506.

It is an arithmetic number, because the mean of its divisors is an integer number (63464957770).

Almost surely, 2^253420626643 is an apocalyptic number.

253420626643 is a deficient number, since it is larger than the sum of its proper divisors (439204437).

253420626643 is an equidigital number, since it uses as much as digits as its factorization.

253420626643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439204436.

The product of its (nonzero) digits is 1244160, while the sum is 43.

The spelling of 253420626643 in words is "two hundred fifty-three billion, four hundred twenty million, six hundred twenty-six thousand, six hundred forty-three".