66519946 has 16 divisors (see below), whose sum is σ = 107899776. Its totient is φ = 30636736.

The previous prime is 66519923. The next prime is 66519953. The reversal of 66519946 is 64991566.

It is a junction number, because it is equal to n+sod(n) for n = 66519896 and 66519905.

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, 19216 + ... + 22411.

It is an arithmetic number, because the mean of its divisors is an integer number (6743736).

Almost surely, 2^66519946 is an apocalyptic number.

66519946 is a deficient number, since it is larger than the sum of its proper divisors (41379830).

66519946 is a wasteful number, since it uses less digits than its factorization.

66519946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41693.

The product of its digits is 349920, while the sum is 46.

The square root of 66519946 is about 8155.9760911861. The cubic root of 66519946 is about 405.1824529750.

The spelling of 66519946 in words is "sixty-six million, five hundred nineteen thousand, nine hundred forty-six".