25440456001 has 4 divisors (see below), whose sum is σ = 26261115904. Its totient is φ = 24619796100.

The previous prime is 25440455947. The next prime is 25440456023. The reversal of 25440456001 is 10065404452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25440456001 - 2¹¹ = 25440453953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 820659871 = 25440456001 / (2 + 5 + 4 + 4 + 0 + 4 + 5 + 6 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25440456061) 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, 410329905 + ... + 410329966.

It is an arithmetic number, because the mean of its divisors is an integer number (6565278976).

Almost surely, 2^25440456001 is an apocalyptic number.

It is an amenable number.

25440456001 is a deficient number, since it is larger than the sum of its proper divisors (820659903).

25440456001 is an equidigital number, since it uses as much as digits as its factorization.

25440456001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820659902.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 25440456001 in words is "twenty-five billion, four hundred forty million, four hundred fifty-six thousand, one".