291229612066 has 4 divisors (see below), whose sum is σ = 436844418102. Its totient is φ = 145614806032.

The previous prime is 291229612049. The next prime is 291229612103. The reversal of 291229612066 is 660216922192.

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., 172373602041 + 118856010025 = 415179^2 + 344755^2 .

It is a super-2 number, since 2×291229612066² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72807403015 + ... + 72807403018.

Almost surely, 2^291229612066 is an apocalyptic number.

291229612066 is a deficient number, since it is larger than the sum of its proper divisors (145614806036).

291229612066 is a wasteful number, since it uses less digits than its factorization.

291229612066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145614806035.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 291229612066 in words is "two hundred ninety-one billion, two hundred twenty-nine million, six hundred twelve thousand, sixty-six".