31645666061 has 4 divisors (see below), whose sum is σ = 31647007392. Its totient is φ = 31644324732.

The previous prime is 31645666057. The next prime is 31645666079. The reversal of 31645666061 is 16066654613.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16066654613 = 179 ⋅89757847.

It is a cyclic number.

It is not a de Polignac number, because 31645666061 - 2² = 31645666057 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 (31645666081) 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, 634631 + ... + 682676.

It is an arithmetic number, because the mean of its divisors is an integer number (7911751848).

Almost surely, 2^31645666061 is an apocalyptic number.

It is an amenable number.

31645666061 is a deficient number, since it is larger than the sum of its proper divisors (1341331).

31645666061 is a wasteful number, since it uses less digits than its factorization.

31645666061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341330.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 31645666061 in words is "thirty-one billion, six hundred forty-five million, six hundred sixty-six thousand, sixty-one".