15412640645 has 4 divisors (see below), whose sum is σ = 18495168780. Its totient is φ = 12330112512.

The previous prime is 15412640641. The next prime is 15412640669. The reversal of 15412640645 is 54604621451.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54604621451 = 373 ⋅146393087.

It can be written as a sum of positive squares in 2 ways, for example, as 6153774916 + 9258865729 = 78446^2 + 96223^2 .

It is a cyclic number.

It is not a de Polignac number, because 15412640645 - 2² = 15412640641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15412640599 and 15412640608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15412640641) 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, 1541264060 + ... + 1541264069.

It is an arithmetic number, because the mean of its divisors is an integer number (4623792195).

Almost surely, 2^15412640645 is an apocalyptic number.

It is an amenable number.

15412640645 is a deficient number, since it is larger than the sum of its proper divisors (3082528135).

15412640645 is an equidigital number, since it uses as much as digits as its factorization.

15412640645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3082528134.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 15412640645 in words is "fifteen billion, four hundred twelve million, six hundred forty thousand, six hundred forty-five".