253561121435 has 4 divisors (see below), whose sum is σ = 304273345728. Its totient is φ = 202848897144.

The previous prime is 253561121431. The next prime is 253561121503. The reversal of 253561121435 is 534121165352.

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

It is a cyclic number.

It is not a de Polignac number, because 253561121435 - 2² = 253561121431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253561121431) 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, 25356112139 + ... + 25356112148.

It is an arithmetic number, because the mean of its divisors is an integer number (76068336432).

Almost surely, 2^253561121435 is an apocalyptic number.

253561121435 is a deficient number, since it is larger than the sum of its proper divisors (50712224293).

253561121435 is an equidigital number, since it uses as much as digits as its factorization.

253561121435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50712224292.

The product of its digits is 108000, while the sum is 38.

Adding to 253561121435 its reverse (534121165352), we get a palindrome (787682286787).

The spelling of 253561121435 in words is "two hundred fifty-three billion, five hundred sixty-one million, one hundred twenty-one thousand, four hundred thirty-five".