66145465 has 4 divisors (see below), whose sum is σ = 79374564. Its totient is φ = 52916368.

The previous prime is 66145427. The next prime is 66145489. The reversal of 66145465 is 56454166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56454166 = 2 ⋅28227083.

It can be written as a sum of positive squares in 2 ways, for example, as 40043584 + 26101881 = 6328^2 + 5109^2 .

It is a cyclic number.

It is not a de Polignac number, because 66145465 - 2⁷ = 66145337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6614542 + ... + 6614551.

It is an arithmetic number, because the mean of its divisors is an integer number (19843641).

Almost surely, 2^66145465 is an apocalyptic number.

It is an amenable number.

66145465 is a deficient number, since it is larger than the sum of its proper divisors (13229099).

66145465 is a wasteful number, since it uses less digits than its factorization.

66145465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13229098.

The product of its digits is 86400, while the sum is 37.

The square root of 66145465 is about 8132.9862289322. The cubic root of 66145465 is about 404.4206826805.

The spelling of 66145465 in words is "sixty-six million, one hundred forty-five thousand, four hundred sixty-five".