666364722364274 has 4 divisors (see below), whose sum is σ = 999547083546414. Its totient is φ = 333182361182136.

The previous prime is 666364722364273. The next prime is 666364722364291. The reversal of 666364722364274 is 472463227463666.

It is a happy number.

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., 643963859332249 + 22400863032025 = 25376443^2 + 4732955^2 .

It is not an unprimeable number, because it can be changed into a prime (666364722364273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166591180591067 + ... + 166591180591070.

Almost surely, 2^{666364722364274} is an apocalyptic number.

666364722364274 is a deficient number, since it is larger than the sum of its proper divisors (333182361182140).

666364722364274 is a wasteful number, since it uses less digits than its factorization.

666364722364274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333182361182139.

The product of its digits is 1755758592, while the sum is 68.

The spelling of 666364722364274 in words is "six hundred sixty-six trillion, three hundred sixty-four billion, seven hundred twenty-two million, three hundred sixty-four thousand, two hundred seventy-four".