16631646120 has 48 divisors (see below), whose sum is σ = 54052851060. Its totient is φ = 4435105536.

The previous prime is 16631646077. The next prime is 16631646121. The reversal of 16631646120 is 2164613661.

It is a happy number.

16631646120 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 1 + 646 + 1 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14395680324 + 2235965796 = 119982^2 + 47286^2 .

It is a super-2 number, since 2×16631646120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16631646121) 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, 23099149 + ... + 23099868.

Almost surely, 2^16631646120 is an apocalyptic number.

16631646120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16631646120 is an abundant number, since it is smaller than the sum of its proper divisors (37421204940).

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

16631646120 is a wasteful number, since it uses less digits than its factorization.

16631646120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46199034 (or 46199027 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

It can be divided in two parts, 16 and 631646120, that added together give a palindrome (631646136).

The spelling of 16631646120 in words is "sixteen billion, six hundred thirty-one million, six hundred forty-six thousand, one hundred twenty".