15654645651 has 4 divisors (see below), whose sum is σ = 20872860872. Its totient is φ = 10436430432.

The previous prime is 15654645637. The next prime is 15654645689.

15654645651 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 15654645651 - 2¹¹ = 15654643603 is a prime.

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 15654645651.

It is not an unprimeable number, because it can be changed into a prime (15654645151) 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, 2609107606 + ... + 2609107611.

It is an arithmetic number, because the mean of its divisors is an integer number (5218215218).

Almost surely, 2^15654645651 is an apocalyptic number.

15654645651 is a deficient number, since it is larger than the sum of its proper divisors (5218215221).

15654645651 is an equidigital number, since it uses as much as digits as its factorization.

15654645651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5218215220.

The product of its digits is 2160000, while the sum is 48.

The spelling of 15654645651 in words is "fifteen billion, six hundred fifty-four million, six hundred forty-five thousand, six hundred fifty-one".