253731144465 has 20 divisors (see below), whose sum is σ = 454836570804. Its totient is φ = 135323276832.

The previous prime is 253731144451. The next prime is 253731144467. The reversal of 253731144465 is 564441137352.

253731144465 is a `hidden beast` number, since 2 + 5 + 3 + 73 + 114 + 4 + 465 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 199851914304 + 53879230161 = 447048^2 + 232119^2 .

It is not a de Polignac number, because 253731144465 - 2¹¹ = 253731142417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 253731144465.

It is not an unprimeable number, because it can be changed into a prime (253731144467) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 313247922 + ... + 313248731.

Almost surely, 2^253731144465 is an apocalyptic number.

It is an amenable number.

253731144465 is a deficient number, since it is larger than the sum of its proper divisors (201105426339).

253731144465 is an equidigital number, since it uses as much as digits as its factorization.

253731144465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626496670 (or 626496661 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 45.

The spelling of 253731144465 in words is "two hundred fifty-three billion, seven hundred thirty-one million, one hundred forty-four thousand, four hundred sixty-five".