66109378 has 16 divisors (see below), whose sum is σ = 101710080. Its totient is φ = 32216800.

The previous prime is 66109339. The next prime is 66109397. The reversal of 66109378 is 87390166.

It is a self number, because there is not a number n which added to its sum of digits gives 66109378.

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, 10023 + ... + 15253.

It is an arithmetic number, because the mean of its divisors is an integer number (6356880).

Almost surely, 2^66109378 is an apocalyptic number.

66109378 is a deficient number, since it is larger than the sum of its proper divisors (35600702).

66109378 is a wasteful number, since it uses less digits than its factorization.

66109378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 66109378 is about 8130.7673684591. The cubic root of 66109378 is about 404.3471226662.

The spelling of 66109378 in words is "sixty-six million, one hundred nine thousand, three hundred seventy-eight".