66502539571966 has 16 divisors (see below), whose sum is σ = 100203996783744. Its totient is φ = 33101215825824.

The previous prime is 66502539571903. The next prime is 66502539572011. The reversal of 66502539571966 is 66917593520566.

It is a junction number, because it is equal to n+sod(n) for n = 66502539571895 and 66502539571904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13640376 + ... + 17862388.

It is an arithmetic number, because the mean of its divisors is an integer number (6262749798984).

Almost surely, 2^{66502539571966} is an apocalyptic number.

66502539571966 is a deficient number, since it is larger than the sum of its proper divisors (33701457211778).

66502539571966 is a wasteful number, since it uses less digits than its factorization.

66502539571966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4257555.

The product of its (nonzero) digits is 551124000, while the sum is 70.

The spelling of 66502539571966 in words is "sixty-six trillion, five hundred two billion, five hundred thirty-nine million, five hundred seventy-one thousand, nine hundred sixty-six".