16620653766 has 16 divisors (see below), whose sum is σ = 33253729344. Its totient is φ = 5538147624.

The previous prime is 16620653747. The next prime is 16620653767. The reversal of 16620653766 is 66735602661.

It is a super-2 number, since 2×16620653766² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16620653767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500136 + ... + 532331.

It is an arithmetic number, because the mean of its divisors is an integer number (2078358084).

Almost surely, 2^16620653766 is an apocalyptic number.

16620653766 is an abundant number, since it is smaller than the sum of its proper divisors (16633075578).

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

16620653766 is a wasteful number, since it uses less digits than its factorization.

16620653766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035155.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 16620653766 in words is "sixteen billion, six hundred twenty million, six hundred fifty-three thousand, seven hundred sixty-six".