61668811 has 4 divisors (see below), whose sum is σ = 61753000. Its totient is φ = 61584624.

The previous prime is 61668799. The next prime is 61668823. The reversal of 61668811 is 11886616.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61668799) and next prime (61668823).

It is a cyclic number.

It is not a de Polignac number, because 61668811 - 2⁵ = 61668779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61668311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40986 + ... + 42463.

It is an arithmetic number, because the mean of its divisors is an integer number (15438250).

Almost surely, 2^61668811 is an apocalyptic number.

61668811 is a deficient number, since it is larger than the sum of its proper divisors (84189).

61668811 is an equidigital number, since it uses as much as digits as its factorization.

61668811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84188.

The product of its digits is 13824, while the sum is 37.

The square root of 61668811 is about 7852.9491912275. The cubic root of 61668811 is about 395.0831657391.

The spelling of 61668811 in words is "sixty-one million, six hundred sixty-eight thousand, eight hundred eleven".