66249145 has 8 divisors (see below), whose sum is σ = 79736904. Its totient is φ = 52840704.

The previous prime is 66249109. The next prime is 66249151. The reversal of 66249145 is 54194266.

It can be written as a sum of positive squares in 4 ways, for example, as 9412624 + 56836521 = 3068^2 + 7539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66249145 - 2²¹ = 64151993 is a prime.

It is a Duffinian number.

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, 17974 + ... + 21343.

It is an arithmetic number, because the mean of its divisors is an integer number (9967113).

Almost surely, 2^66249145 is an apocalyptic number.

It is an amenable number.

66249145 is a deficient number, since it is larger than the sum of its proper divisors (13487759).

66249145 is a wasteful number, since it uses less digits than its factorization.

66249145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39659.

The product of its digits is 51840, while the sum is 37.

The square root of 66249145 is about 8139.3577756479. The cubic root of 66249145 is about 404.6318760328.

The spelling of 66249145 in words is "sixty-six million, two hundred forty-nine thousand, one hundred forty-five".