61521366 has 16 divisors (see below), whose sum is σ = 128392704. Its totient is φ = 19615464.

The previous prime is 61521359. The next prime is 61521379. The reversal of 61521366 is 66312516.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 222766 + ... + 223041.

It is an arithmetic number, because the mean of its divisors is an integer number (8024544).

Almost surely, 2^61521366 is an apocalyptic number.

61521366 is an abundant number, since it is smaller than the sum of its proper divisors (66871338).

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

61521366 is a wasteful number, since it uses less digits than its factorization.

61521366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445835.

The product of its digits is 6480, while the sum is 30.

The square root of 61521366 is about 7843.5556987887. Note that the first 3 decimals coincide. The cubic root of 61521366 is about 394.7680441282.

The spelling of 61521366 in words is "sixty-one million, five hundred twenty-one thousand, three hundred sixty-six".