61601777 has 4 divisors (see below), whose sum is σ = 61690356. Its totient is φ = 61513200.

The previous prime is 61601773. The next prime is 61601779. The reversal of 61601777 is 77710616.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51609856 + 9991921 = 7184^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 61601777 - 2² = 61601773 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61601773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43238 + ... + 44639.

It is an arithmetic number, because the mean of its divisors is an integer number (15422589).

Almost surely, 2^61601777 is an apocalyptic number.

It is an amenable number.

61601777 is a deficient number, since it is larger than the sum of its proper divisors (88579).

61601777 is an equidigital number, since it uses as much as digits as its factorization.

61601777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88578.

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 61601777 is about 7848.6799527054. The cubic root of 61601777 is about 394.9399620335.

The spelling of 61601777 in words is "sixty-one million, six hundred one thousand, seven hundred seventy-seven".