1936561661 has 8 divisors (see below), whose sum is σ = 2032915200. Its totient is φ = 1842325920.

The previous prime is 1936561657. The next prime is 1936561663. The reversal of 1936561661 is 1661656391.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1936561661 - 2² = 1936561657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1936561663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527576 + ... + 531233.

It is an arithmetic number, because the mean of its divisors is an integer number (254114400).

Almost surely, 2^1936561661 is an apocalyptic number.

It is an amenable number.

1936561661 is a deficient number, since it is larger than the sum of its proper divisors (96353539).

1936561661 is a wasteful number, since it uses less digits than its factorization.

1936561661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058899.

The product of its digits is 174960, while the sum is 44.

The square root of 1936561661 is about 44006.3820485166. The cubic root of 1936561661 is about 1246.4564517852.

The spelling of 1936561661 in words is "one billion, nine hundred thirty-six million, five hundred sixty-one thousand, six hundred sixty-one".