61660777 has 2 divisors, whose sum is σ = 61660778. Its totient is φ = 61660776.

The previous prime is 61660657. The next prime is 61660787. The reversal of 61660777 is 77706616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30958096 + 30702681 = 5564^2 + 5541^2 .

It is a cyclic number.

It is not a de Polignac number, because 61660777 - 2¹⁹ = 61136489 is a prime.

It is not a weakly prime, because it can be changed into another prime (61660787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30830388 + 30830389.

It is an arithmetic number, because the mean of its divisors is an integer number (30830389).

Almost surely, 2^61660777 is an apocalyptic number.

It is an amenable number.

61660777 is a deficient number, since it is larger than the sum of its proper divisors (1).

61660777 is an equidigital number, since it uses as much as digits as its factorization.

61660777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 61660777 is about 7852.4376469985. The cubic root of 61660777 is about 395.0660083033.

The spelling of 61660777 in words is "sixty-one million, six hundred sixty thousand, seven hundred seventy-seven".