66451946 has 16 divisors (see below), whose sum is σ = 115136640. Its totient is φ = 28428480.

The previous prime is 66451933. The next prime is 66451951. The reversal of 66451946 is 64915466.

It is a super-2 number, since 2×66451946² = 8831722254373832, which contains 22 as substring.

It is a Curzon 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, 88466 + ... + 89213.

It is an arithmetic number, because the mean of its divisors is an integer number (7196040).

Almost surely, 2^66451946 is an apocalyptic number.

66451946 is a deficient number, since it is larger than the sum of its proper divisors (48684694).

66451946 is a wasteful number, since it uses less digits than its factorization.

66451946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177709.

The product of its digits is 155520, while the sum is 41.

The square root of 66451946 is about 8151.8063029000. The cubic root of 66451946 is about 405.0443400115.

The spelling of 66451946 in words is "sixty-six million, four hundred fifty-one thousand, nine hundred forty-six".