66561050 has 24 divisors (see below), whose sum is σ = 124578336. Its totient is φ = 26457840.

The previous prime is 66561041. The next prime is 66561059. The reversal of 66561050 is 5016566.

It is an interprime number because it is at equal distance from previous prime (66561041) and next prime (66561059).

It is not an unprimeable number, because it can be changed into a prime (66561059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4067 + ... + 12233.

It is an arithmetic number, because the mean of its divisors is an integer number (5190764).

Almost surely, 2^66561050 is an apocalyptic number.

66561050 is a deficient number, since it is larger than the sum of its proper divisors (58017286).

66561050 is a wasteful number, since it uses less digits than its factorization.

66561050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8342 (or 8337 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 66561050 is about 8158.4955721015. The cubic root of 66561050 is about 405.2658925613.

The spelling of 66561050 in words is "sixty-six million, five hundred sixty-one thousand, fifty".