16405634497 has 4 divisors (see below), whose sum is σ = 18749296576. Its totient is φ = 14061972420.

The previous prime is 16405634471. The next prime is 16405634551. The reversal of 16405634497 is 79443650461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16405634497 - 2²³ = 16397245889 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 16405634497.

It is not an unprimeable number, because it can be changed into a prime (16405634197) 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, 1171831029 + ... + 1171831042.

It is an arithmetic number, because the mean of its divisors is an integer number (4687324144).

Almost surely, 2^16405634497 is an apocalyptic number.

It is an amenable number.

16405634497 is a deficient number, since it is larger than the sum of its proper divisors (2343662079).

16405634497 is an equidigital number, since it uses as much as digits as its factorization.

16405634497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343662078.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 16405634497 in words is "sixteen billion, four hundred five million, six hundred thirty-four thousand, four hundred ninety-seven".