20521046066066 has 32 divisors (see below), whose sum is σ = 37885267314048. Its totient is φ = 8118160485120.

The previous prime is 20521046066063. The next prime is 20521046066111. The reversal of 20521046066066 is 66066064012502.

It is a happy number.

It is a super-2 number, since 2×20521046066066² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20521046066063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35371706 + ... + 35947178.

It is an arithmetic number, because the mean of its divisors is an integer number (1183914603564).

Almost surely, 2^{20521046066066} is an apocalyptic number.

20521046066066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20521046066066 is a deficient number, since it is larger than the sum of its proper divisors (17364221247982).

20521046066066 is a wasteful number, since it uses less digits than its factorization.

20521046066066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771426.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 20521046066066 in words is "twenty trillion, five hundred twenty-one billion, forty-six million, sixty-six thousand, sixty-six".