253643450665 has 48 divisors (see below), whose sum is σ = 346288173840. Its totient is φ = 178007244800.

The previous prime is 253643450663. The next prime is 253643450699. The reversal of 253643450665 is 566054346352.

It can be written as a sum of positive squares in 8 ways, for example, as 4693346064 + 248950104601 = 68508^2 + 498949^2 .

It is not a de Polignac number, because 253643450665 - 2¹ = 253643450663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253643450663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46614345 + ... + 46619785.

It is an arithmetic number, because the mean of its divisors is an integer number (7214336955).

Almost surely, 2^253643450665 is an apocalyptic number.

It is an amenable number.

253643450665 is a deficient number, since it is larger than the sum of its proper divisors (92644723175).

253643450665 is a wasteful number, since it uses less digits than its factorization.

253643450665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8154 (or 8143 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 49.

The spelling of 253643450665 in words is "two hundred fifty-three billion, six hundred forty-three million, four hundred fifty thousand, six hundred sixty-five".