66854686237 has 2 divisors, whose sum is σ = 66854686238. Its totient is φ = 66854686236.

The previous prime is 66854686219. The next prime is 66854686277. The reversal of 66854686237 is 73268645866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65614871716 + 1239814521 = 256154^2 + 35211^2 .

It is a cyclic number.

It is not a de Polignac number, because 66854686237 - 2³⁵ = 32494947869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66854686277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33427343118 + 33427343119.

It is an arithmetic number, because the mean of its divisors is an integer number (33427343119).

Almost surely, 2^66854686237 is an apocalyptic number.

It is an amenable number.

66854686237 is a deficient number, since it is larger than the sum of its proper divisors (1).

66854686237 is an equidigital number, since it uses as much as digits as its factorization.

66854686237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69672960, while the sum is 61.

The spelling of 66854686237 in words is "sixty-six billion, eight hundred fifty-four million, six hundred eighty-six thousand, two hundred thirty-seven".