12315450644 has 12 divisors (see below), whose sum is σ = 24630901344. Its totient is φ = 5278050264.

The previous prime is 12315450643. The next prime is 12315450689. The reversal of 12315450644 is 44605451321.

12315450644 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12315450643) 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, 219918734 + ... + 219918789.

It is an arithmetic number, because the mean of its divisors is an integer number (2052575112).

Almost surely, 2^12315450644 is an apocalyptic number.

12315450644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12315450644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12315450644 is a wasteful number, since it uses less digits than its factorization.

12315450644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439837534 (or 439837532 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 12315450644 in words is "twelve billion, three hundred fifteen million, four hundred fifty thousand, six hundred forty-four".