66503377 has 4 divisors (see below), whose sum is σ = 66556260. Its totient is φ = 66450496.

The previous prime is 66503369. The next prime is 66503387. The reversal of 66503377 is 77330566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77330566 = 2 ⋅38665283.

It can be written as a sum of positive squares in 2 ways, for example, as 62110161 + 4393216 = 7881^2 + 2096^2 .

It is a cyclic number.

It is not a de Polignac number, because 66503377 - 2³ = 66503369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66503317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24508 + ... + 27085.

It is an arithmetic number, because the mean of its divisors is an integer number (16639065).

Almost surely, 2^66503377 is an apocalyptic number.

It is an amenable number.

66503377 is a deficient number, since it is larger than the sum of its proper divisors (52883).

66503377 is a wasteful number, since it uses less digits than its factorization.

66503377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52882.

The product of its (nonzero) digits is 79380, while the sum is 37.

The square root of 66503377 is about 8154.9602696764. The cubic root of 66503377 is about 405.1488088029.

The spelling of 66503377 in words is "sixty-six million, five hundred three thousand, three hundred seventy-seven".