16380646644 has 24 divisors (see below), whose sum is σ = 39883314240. Its totient is φ = 5222814784.

The previous prime is 16380646637. The next prime is 16380646649. The reversal of 16380646644 is 44664608361.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16380646593 and 16380646602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16380646649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29674809 + ... + 29675360.

It is an arithmetic number, because the mean of its divisors is an integer number (1661804760).

Almost surely, 2^16380646644 is an apocalyptic number.

It is an amenable number.

16380646644 is an abundant number, since it is smaller than the sum of its proper divisors (23502667596).

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

16380646644 is a wasteful number, since it uses less digits than its factorization.

16380646644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59350199 (or 59350197 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 48.

The spelling of 16380646644 in words is "sixteen billion, three hundred eighty million, six hundred forty-six thousand, six hundred forty-four".