66209031952783 has 16 divisors (see below), whose sum is σ = 70396154934336. Its totient is φ = 62054417756160.

The previous prime is 66209031952759. The next prime is 66209031952799. The reversal of 66209031952783 is 38725913090266.

It is a cyclic number.

It is not a de Polignac number, because 66209031952783 - 2⁵ = 66209031952751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66209031956783) 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, 211547910 + ... + 211860652.

It is an arithmetic number, because the mean of its divisors is an integer number (4399759683396).

Almost surely, 2^{66209031952783} is an apocalyptic number.

66209031952783 is a deficient number, since it is larger than the sum of its proper divisors (4187122981553).

66209031952783 is a wasteful number, since it uses less digits than its factorization.

66209031952783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364674.

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 66209031952783 in words is "sixty-six trillion, two hundred nine billion, thirty-one million, nine hundred fifty-two thousand, seven hundred eighty-three".