1225664646431 has 4 divisors (see below), whose sum is σ = 1225689007392. Its totient is φ = 1225640285472.

The previous prime is 1225664646407. The next prime is 1225664646433. The reversal of 1225664646431 is 1346464665221.

It is a happy number.

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 1225664646431 - 2¹⁰ = 1225664645407 is a prime.

It is a super-2 number, since 2×1225664646431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1225664646431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225664646433) 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, 12104855 + ... + 12205688.

It is an arithmetic number, because the mean of its divisors is an integer number (306422251848).

Almost surely, 2^{1225664646431} is an apocalyptic number.

1225664646431 is a deficient number, since it is larger than the sum of its proper divisors (24360961).

1225664646431 is an equidigital number, since it uses as much as digits as its factorization.

1225664646431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24360960.

The product of its digits is 4976640, while the sum is 50.

The spelling of 1225664646431 in words is "one trillion, two hundred twenty-five billion, six hundred sixty-four million, six hundred forty-six thousand, four hundred thirty-one".