66997770022 has 32 divisors (see below), whose sum is σ = 101609877600. Its totient is φ = 33130487808.

The previous prime is 66997770019. The next prime is 66997770023. The reversal of 66997770022 is 22007779966.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66997770023) 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 in 15 ways as a sum of consecutive naturals, for example, 87122854 + ... + 87123622.

It is an arithmetic number, because the mean of its divisors is an integer number (3175308675).

Almost surely, 2^66997770022 is an apocalyptic number.

66997770022 is a deficient number, since it is larger than the sum of its proper divisors (34612107578).

66997770022 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (66997770021) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1960).

66997770022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960.

The product of its (nonzero) digits is 4000752, while the sum is 55.

The spelling of 66997770022 in words is "sixty-six billion, nine hundred ninety-seven million, seven hundred seventy thousand, twenty-two".