51664042 has 16 divisors (see below), whose sum is σ = 80619264. Its totient is φ = 24804000.

The previous prime is 51664033. The next prime is 51664057. The reversal of 51664042 is 24046615.

It is a self number, because there is not a number n which added to its sum of digits gives 51664042.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4942 + ... + 11302.

It is an arithmetic number, because the mean of its divisors is an integer number (5038704).

Almost surely, 2^51664042 is an apocalyptic number.

51664042 is a deficient number, since it is larger than the sum of its proper divisors (28955222).

51664042 is a wasteful number, since it uses less digits than its factorization.

51664042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6525.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 51664042 is about 7187.7703079606. The cubic root of 51664042 is about 372.4455533532.

The spelling of 51664042 in words is "fifty-one million, six hundred sixty-four thousand, forty-two".