20661523712612 has 6 divisors (see below), whose sum is σ = 36157666497078. Its totient is φ = 10330761856304.

The previous prime is 20661523712537. The next prime is 20661523712623. The reversal of 20661523712612 is 21621732516602.

It can be written as a sum of positive squares in only one way, i.e., 18195292172836 + 2466231539776 = 4265594^2 + 1570424^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2582690464073 + ... + 2582690464080.

It is an arithmetic number, because the mean of its divisors is an integer number (6026277749513).

Almost surely, 2^{20661523712612} is an apocalyptic number.

It is an amenable number.

20661523712612 is a deficient number, since it is larger than the sum of its proper divisors (15496142784466).

20661523712612 is a wasteful number, since it uses less digits than its factorization.

20661523712612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5165380928157 (or 5165380928155 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 20661523712612 in words is "twenty trillion, six hundred sixty-one billion, five hundred twenty-three million, seven hundred twelve thousand, six hundred twelve".