66973510 has 16 divisors (see below), whose sum is σ = 121127472. Its totient is φ = 26661600.

The previous prime is 66973507. The next prime is 66973573. The reversal of 66973510 is 1537966.

It is a self number, because there is not a number n which added to its sum of digits gives 66973510.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13761 + ... + 17980.

It is an arithmetic number, because the mean of its divisors is an integer number (7570467).

Almost surely, 2^66973510 is an apocalyptic number.

66973510 is a deficient number, since it is larger than the sum of its proper divisors (54153962).

66973510 is a wasteful number, since it uses less digits than its factorization.

66973510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31959.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 66973510 is about 8183.7344776086. The cubic root of 66973510 is about 406.1012754218.

The spelling of 66973510 in words is "sixty-six million, nine hundred seventy-three thousand, five hundred ten".