20735385066666 has 12 divisors (see below), whose sum is σ = 44926667644482. Its totient is φ = 6911795022216.

The previous prime is 20735385066647. The next prime is 20735385066673. The reversal of 20735385066666 is 66666058353702.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20733260317641 + 2124749025 = 4553379^2 + 46095^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575982918501 + ... + 575982918536.

Almost surely, 2^{20735385066666} is an apocalyptic number.

20735385066666 is an abundant number, since it is smaller than the sum of its proper divisors (24191282577816).

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

20735385066666 is a wasteful number, since it uses less digits than its factorization.

20735385066666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151965837045 (or 1151965837042 counting only the distinct ones).

The product of its (nonzero) digits is 195955200, while the sum is 63.

The spelling of 20735385066666 in words is "twenty trillion, seven hundred thirty-five billion, three hundred eighty-five million, sixty-six thousand, six hundred sixty-six".