51243604066 has 16 divisors (see below), whose sum is σ = 80162933760. Its totient is φ = 24539667840.

The previous prime is 51243604051. The next prime is 51243604073. The reversal of 51243604066 is 66040634215.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4254346 + ... + 4266373.

It is an arithmetic number, because the mean of its divisors is an integer number (5010183360).

Almost surely, 2^51243604066 is an apocalyptic number.

51243604066 is a deficient number, since it is larger than the sum of its proper divisors (28919329694).

51243604066 is a wasteful number, since it uses less digits than its factorization.

51243604066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8520849.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 51243604066 in words is "fifty-one billion, two hundred forty-three million, six hundred four thousand, sixty-six".