15665116622007 has 4 divisors (see below), whose sum is σ = 20886822162680. Its totient is φ = 10443411081336.

The previous prime is 15665116621991. The next prime is 15665116622017. The reversal of 15665116622007 is 70022661156651.

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

It is not a de Polignac number, because 15665116622007 - 2⁴ = 15665116621991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15665116622017) 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, 2610852770332 + ... + 2610852770337.

It is an arithmetic number, because the mean of its divisors is an integer number (5221705540670).

Almost surely, 2^{15665116622007} is an apocalyptic number.

15665116622007 is a deficient number, since it is larger than the sum of its proper divisors (5221705540673).

15665116622007 is an equidigital number, since it uses as much as digits as its factorization.

15665116622007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221705540672.

The product of its (nonzero) digits is 907200, while the sum is 48.

Adding to 15665116622007 its reverse (70022661156651), we get a palindrome (85687777778658).

The spelling of 15665116622007 in words is "fifteen trillion, six hundred sixty-five billion, one hundred sixteen million, six hundred twenty-two thousand, seven".