20651416166 has 16 divisors (see below), whose sum is σ = 31596253008. Its totient is φ = 10120528800.

The previous prime is 20651416153. The next prime is 20651416189. The reversal of 20651416166 is 66161415602.

It is a happy number.

It is a super-2 number, since 2×20651416166² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264545 + ... + 333596.

It is an arithmetic number, because the mean of its divisors is an integer number (1974765813).

Almost surely, 2^20651416166 is an apocalyptic number.

20651416166 is a deficient number, since it is larger than the sum of its proper divisors (10944836842).

20651416166 is a wasteful number, since it uses less digits than its factorization.

20651416166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598487.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 20651416166 in words is "twenty billion, six hundred fifty-one million, four hundred sixteen thousand, one hundred sixty-six".