66444404626 has 8 divisors (see below), whose sum is σ = 99718173324. Its totient is φ = 33205013520.

The previous prime is 66444404567. The next prime is 66444404629. The reversal of 66444404626 is 62640444466.

It can be written as a sum of positive squares in 2 ways, for example, as 65856390625 + 588014001 = 256625^2 + 24249^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66444404626² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66444404629) 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 3 ways as a sum of consecutive naturals, for example, 8589565 + ... + 8597296.

Almost surely, 2^66444404626 is an apocalyptic number.

66444404626 is a deficient number, since it is larger than the sum of its proper divisors (33273768698).

66444404626 is a wasteful number, since it uses less digits than its factorization.

66444404626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17188796.

The product of its (nonzero) digits is 2654208, while the sum is 46.

The spelling of 66444404626 in words is "sixty-six billion, four hundred forty-four million, four hundred four thousand, six hundred twenty-six".