31544204661 has 24 divisors (see below), whose sum is σ = 45738836000. Its totient is φ = 20948868000.

The previous prime is 31544204647. The next prime is 31544204693. The reversal of 31544204661 is 16640244513.

31544204661 is a `hidden beast` number, since 3 + 154 + 42 + 0 + 466 + 1 = 666.

It is not a de Polignac number, because 31544204661 - 2⁷ = 31544204533 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 (31544204261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2558211 + ... + 2570511.

Almost surely, 2^31544204661 is an apocalyptic number.

It is an amenable number.

31544204661 is a deficient number, since it is larger than the sum of its proper divisors (14194631339).

31544204661 is a wasteful number, since it uses less digits than its factorization.

31544204661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13377 (or 13374 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 31544204661 in words is "thirty-one billion, five hundred forty-four million, two hundred four thousand, six hundred sixty-one".