12405635646 has 8 divisors (see below), whose sum is σ = 24811271304. Its totient is φ = 4135211880.

The previous prime is 12405635617. The next prime is 12405635657. The reversal of 12405635646 is 64653650421.

It is a sphenic number, since it is the product of 3 distinct primes.

12405635646 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 12405635598 and 12405635607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1033802965 + ... + 1033802976.

It is an arithmetic number, because the mean of its divisors is an integer number (3101408913).

Almost surely, 2^12405635646 is an apocalyptic number.

12405635646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12405635646 is a wasteful number, since it uses less digits than its factorization.

12405635646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067605946.

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 12405635646 in words is "twelve billion, four hundred five million, six hundred thirty-five thousand, six hundred forty-six".