16687564722 has 24 divisors (see below), whose sum is σ = 36163170576. Its totient is φ = 5561478456.

The previous prime is 16687564681. The next prime is 16687564723. The reversal of 16687564722 is 22746578661.

It is a happy number.

16687564722 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 7 + 564 + 72 + 2 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16687564723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14953 + ... + 183299.

It is an arithmetic number, because the mean of its divisors is an integer number (1506798774).

Almost surely, 2^16687564722 is an apocalyptic number.

16687564722 is an abundant number, since it is smaller than the sum of its proper divisors (19475605854).

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

16687564722 is a wasteful number, since it uses less digits than its factorization.

16687564722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173862 (or 173859 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The spelling of 16687564722 in words is "sixteen billion, six hundred eighty-seven million, five hundred sixty-four thousand, seven hundred twenty-two".