66040306646 has 8 divisors (see below), whose sum is σ = 99653636880. Its totient is φ = 32822427688.

The previous prime is 66040306639. The next prime is 66040306669. The reversal of 66040306646 is 64660304066.

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

It is a super-2 number, since 2×66040306646² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98862401 + ... + 98863068.

It is an arithmetic number, because the mean of its divisors is an integer number (12456704610).

Almost surely, 2^66040306646 is an apocalyptic number.

66040306646 is a deficient number, since it is larger than the sum of its proper divisors (33613330234).

66040306646 is a wasteful number, since it uses less digits than its factorization.

66040306646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197725638.

The product of its (nonzero) digits is 373248, while the sum is 41.

The spelling of 66040306646 in words is "sixty-six billion, forty million, three hundred six thousand, six hundred forty-six".