66121530 has 32 divisors (see below), whose sum is σ = 162385344. Its totient is φ = 17222016.

The previous prime is 66121529. The next prime is 66121547. The reversal of 66121530 is 3512166.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66121530.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24339 + ... + 26918.

It is an arithmetic number, because the mean of its divisors is an integer number (5074542).

Almost surely, 2^66121530 is an apocalyptic number.

66121530 is an abundant number, since it is smaller than the sum of its proper divisors (96263814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66121530 is a wasteful number, since it uses less digits than its factorization.

66121530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51310.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 66121530 is about 8131.5146190608. The cubic root of 66121530 is about 404.3718963839.

Adding to 66121530 its reverse (3512166), we get a palindrome (69633696).

The spelling of 66121530 in words is "sixty-six million, one hundred twenty-one thousand, five hundred thirty".