253243215340 has 24 divisors (see below), whose sum is σ = 554932959840. Its totient is φ = 96893056128.

The previous prime is 253243215331. The next prime is 253243215341. The reversal of 253243215340 is 43512342352.

It is a super-2 number, since 2×253243215340² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 253243215296 and 253243215305.

It is not an unprimeable number, because it can be changed into a prime (253243215341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275263905 + ... + 275264824.

It is an arithmetic number, because the mean of its divisors is an integer number (23122206660).

Almost surely, 2^253243215340 is an apocalyptic number.

253243215340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253243215340 is an abundant number, since it is smaller than the sum of its proper divisors (301689744500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

253243215340 is a wasteful number, since it uses less digits than its factorization.

253243215340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550528761 (or 550528759 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 34.

Adding to 253243215340 its reverse (43512342352), we get a palindrome (296755557692).

The spelling of 253243215340 in words is "two hundred fifty-three billion, two hundred forty-three million, two hundred fifteen thousand, three hundred forty".