66473770 has 48 divisors (see below), whose sum is σ = 132809544. Its totient is φ = 23936000.

The previous prime is 66473753. The next prime is 66473777. The reversal of 66473770 is 7737466.

It can be written as a sum of positive squares in 4 ways, for example, as 66080641 + 393129 = 8129^2 + 627^2 .

It is not an unprimeable number, because it can be changed into a prime (66473777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165570 + ... + 165970.

Almost surely, 2^66473770 is an apocalyptic number.

66473770 is a deficient number, since it is larger than the sum of its proper divisors (66335774).

66473770 is a wasteful number, since it uses less digits than its factorization.

66473770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 40.

The square root of 66473770 is about 8153.1447920419. The cubic root of 66473770 is about 405.0886764114.

The spelling of 66473770 in words is "sixty-six million, four hundred seventy-three thousand, seven hundred seventy".