1661116077 has 12 divisors (see below), whose sum is σ = 2399849244. Its totient is φ = 1107198720.

The previous prime is 1661116069. The next prime is 1661116091. The reversal of 1661116077 is 7706111661.

It can be written as a sum of positive squares in 2 ways, for example, as 1484252676 + 176863401 = 38526^2 + 13299^2 .

It is not a de Polignac number, because 1661116077 - 2³ = 1661116069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661116007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42877 + ... + 71837.

It is an arithmetic number, because the mean of its divisors is an integer number (199987437).

Almost surely, 2^1661116077 is an apocalyptic number.

It is an amenable number.

1661116077 is a deficient number, since it is larger than the sum of its proper divisors (738733167).

1661116077 is a wasteful number, since it uses less digits than its factorization.

1661116077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35340 (or 35337 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 1661116077 is about 40756.7917898355. The cubic root of 1661116077 is about 1184.3134473127.

The spelling of 1661116077 in words is "one billion, six hundred sixty-one million, one hundred sixteen thousand, seventy-seven".