61616777 has 2 divisors, whose sum is σ = 61616778. Its totient is φ = 61616776.

The previous prime is 61616773. The next prime is 61616831. The reversal of 61616777 is 77761616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39891856 + 21724921 = 6316^2 + 4661^2 .

It is a cyclic number.

It is not a de Polignac number, because 61616777 - 2² = 61616773 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61616773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30808388 + 30808389.

It is an arithmetic number, because the mean of its divisors is an integer number (30808389).

Almost surely, 2^61616777 is an apocalyptic number.

It is an amenable number.

61616777 is a deficient number, since it is larger than the sum of its proper divisors (1).

61616777 is an equidigital number, since it uses as much as digits as its factorization.

61616777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 41.

The square root of 61616777 is about 7849.6354692431. The cubic root of 61616777 is about 394.9720153223.

The spelling of 61616777 in words is "sixty-one million, six hundred sixteen thousand, seven hundred seventy-seven".