91683983661 has 4 divisors (see below), whose sum is σ = 122245311552. Its totient is φ = 61122655772.

The previous prime is 91683983639. The next prime is 91683983683. The reversal of 91683983661 is 16638938619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (91683983639) and next prime (91683983683).

It is a cyclic number.

It is not a de Polignac number, because 91683983661 - 2³¹ = 89536500013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91683983595 and 91683983604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91683983621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15280663941 + ... + 15280663946.

It is an arithmetic number, because the mean of its divisors is an integer number (30561327888).

Almost surely, 2^91683983661 is an apocalyptic number.

It is an amenable number.

91683983661 is a deficient number, since it is larger than the sum of its proper divisors (30561327891).

91683983661 is a wasteful number, since it uses less digits than its factorization.

91683983661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30561327890.

The product of its digits is 10077696, while the sum is 60.

The spelling of 91683983661 in words is "ninety-one billion, six hundred eighty-three million, nine hundred eighty-three thousand, six hundred sixty-one".