61513666 has 16 divisors (see below), whose sum is σ = 93738240. Its totient is φ = 30270240.

The previous prime is 61513649. The next prime is 61513687. The reversal of 61513666 is 66631516.

It is a super-2 number, since 2×61513666² = 7567862209519112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97171 + ... + 97801.

It is an arithmetic number, because the mean of its divisors is an integer number (5858640).

Almost surely, 2^61513666 is an apocalyptic number.

61513666 is a deficient number, since it is larger than the sum of its proper divisors (32224574).

61513666 is a wasteful number, since it uses less digits than its factorization.

61513666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329.

The product of its digits is 19440, while the sum is 34.

The square root of 61513666 is about 7843.0648346166. The cubic root of 61513666 is about 394.7515737485.

The spelling of 61513666 in words is "sixty-one million, five hundred thirteen thousand, six hundred sixty-six".