66151681306 has 4 divisors (see below), whose sum is σ = 99227521962. Its totient is φ = 33075840652.

The previous prime is 66151681261. The next prime is 66151681319. The reversal of 66151681306 is 60318615166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64216121281 + 1935560025 = 253409^2 + 43995^2 .

It is a super-2 number, since 2×66151681306² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16537920325 + ... + 16537920328.

Almost surely, 2^66151681306 is an apocalyptic number.

66151681306 is a deficient number, since it is larger than the sum of its proper divisors (33075840656).

66151681306 is a wasteful number, since it uses less digits than its factorization.

66151681306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33075840655.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 66151681306 in words is "sixty-six billion, one hundred fifty-one million, six hundred eighty-one thousand, three hundred six".