16505624797 has 4 divisors (see below), whose sum is σ = 16569849276. Its totient is φ = 16441400320.

The previous prime is 16505624791. The next prime is 16505624809. The reversal of 16505624797 is 79742650561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79742650561 = 7 ⋅11391807223.

It can be written as a sum of positive squares in 2 ways, for example, as 16440111961 + 65512836 = 128219^2 + 8094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16505624797 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 (16505624791) 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, 32111854 + ... + 32112367.

It is an arithmetic number, because the mean of its divisors is an integer number (4142462319).

Almost surely, 2^16505624797 is an apocalyptic number.

It is an amenable number.

16505624797 is a deficient number, since it is larger than the sum of its proper divisors (64224479).

16505624797 is an equidigital number, since it uses as much as digits as its factorization.

16505624797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64224478.

The product of its (nonzero) digits is 3175200, while the sum is 52.

The spelling of 16505624797 in words is "sixteen billion, five hundred five million, six hundred twenty-four thousand, seven hundred ninety-seven".