61661011 has 8 divisors (see below), whose sum is σ = 63202304. Its totient is φ = 60124680.

The previous prime is 61660969. The next prime is 61661027. The reversal of 61661011 is 11016616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61661011 - 2¹³ = 61652819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61661051) by changing a digit.

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, 41890 + ... + 43336.

It is an arithmetic number, because the mean of its divisors is an integer number (7900288).

Almost surely, 2^61661011 is an apocalyptic number.

61661011 is a deficient number, since it is larger than the sum of its proper divisors (1541293).

61661011 is a wasteful number, since it uses less digits than its factorization.

61661011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 61661011 is about 7852.4525468162. The cubic root of 61661011 is about 395.0665080555.

Adding to 61661011 its reverse (11016616), we get a palindrome (72677627).

The spelling of 61661011 in words is "sixty-one million, six hundred sixty-one thousand, eleven".