1661116079 has 4 divisors (see below), whose sum is σ = 1898418384. Its totient is φ = 1423813776.

The previous prime is 1661116069. The next prime is 1661116091. The reversal of 1661116079 is 9706111661.

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

It is not a de Polignac number, because 1661116079 - 2⁴ = 1661116063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661116069) 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, 118651142 + ... + 118651155.

It is an arithmetic number, because the mean of its divisors is an integer number (474604596).

Almost surely, 2^1661116079 is an apocalyptic number.

1661116079 is a deficient number, since it is larger than the sum of its proper divisors (237302305).

1661116079 is an equidigital number, since it uses as much as digits as its factorization.

1661116079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237302304.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 1661116079 is about 40756.7918143713. The cubic root of 1661116079 is about 1184.3134477880.

The spelling of 1661116079 in words is "one billion, six hundred sixty-one million, one hundred sixteen thousand, seventy-nine".