66487545 has 12 divisors (see below), whose sum is σ = 115245156. Its totient is φ = 35460000.

The previous prime is 66487511. The next prime is 66487567. The reversal of 66487545 is 54578466.

66487545 is a `hidden beast` number, since 66 + 48 + 7 + 545 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 37197801 + 29289744 = 6099^2 + 5412^2 .

It is not a de Polignac number, because 66487545 - 2¹² = 66483449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1477501 = 66487545 / (6 + 6 + 4 + 8 + 7 + 5 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 66487545.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 738706 + ... + 738795.

It is an arithmetic number, because the mean of its divisors is an integer number (9603763).

Almost surely, 2^66487545 is an apocalyptic number.

It is an amenable number.

66487545 is a deficient number, since it is larger than the sum of its proper divisors (48757611).

66487545 is a wasteful number, since it uses less digits than its factorization.

66487545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477512 (or 1477509 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 66487545 is about 8153.9895143420. The cubic root of 66487545 is about 405.1166559243.

It can be divided in two parts, 664 and 87545, that added together give a square (88209 = 297²).

The spelling of 66487545 in words is "sixty-six million, four hundred eighty-seven thousand, five hundred forty-five".