61661113 has 2 divisors, whose sum is σ = 61661114. Its totient is φ = 61661112.

The previous prime is 61661111. The next prime is 61661123. The reversal of 61661113 is 31116616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49744809 + 11916304 = 7053^2 + 3452^2 .

It is a cyclic number.

It is not a de Polignac number, because 61661113 - 2¹ = 61661111 is a prime.

Together with 61661111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61661111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30830556 + 30830557.

It is an arithmetic number, because the mean of its divisors is an integer number (30830557).

Almost surely, 2^61661113 is an apocalyptic number.

It is an amenable number.

61661113 is a deficient number, since it is larger than the sum of its proper divisors (1).

61661113 is an equidigital number, since it uses as much as digits as its factorization.

61661113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 25.

The square root of 61661113 is about 7852.4590415996. The cubic root of 61661113 is about 395.0667258958.

Adding to 61661113 its reverse (31116616), we get a palindrome (92777729).

The spelling of 61661113 in words is "sixty-one million, six hundred sixty-one thousand, one hundred thirteen".