66191345 has 32 divisors (see below), whose sum is σ = 92292480. Its totient is φ = 45066240.

The previous prime is 66191327. The next prime is 66191351. The reversal of 66191345 is 54319166.

It is not a de Polignac number, because 66191345 - 2¹² = 66187249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101039 + ... + 101691.

It is an arithmetic number, because the mean of its divisors is an integer number (2884140).

Almost surely, 2^66191345 is an apocalyptic number.

It is an amenable number.

66191345 is a deficient number, since it is larger than the sum of its proper divisors (26101135).

66191345 is a wasteful number, since it uses less digits than its factorization.

66191345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785.

The product of its digits is 19440, while the sum is 35.

The square root of 66191345 is about 8135.8063521694. The cubic root of 66191345 is about 404.5141661998.

The spelling of 66191345 in words is "sixty-six million, one hundred ninety-one thousand, three hundred forty-five".