31255651661 has 8 divisors (see below), whose sum is σ = 34006943544. Its totient is φ = 28553932800.

The previous prime is 31255651627. The next prime is 31255651663. The reversal of 31255651661 is 16615655213.

It can be written as a sum of positive squares in 4 ways, for example, as 1212362761 + 30043288900 = 34819^2 + 173330^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31255651661 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 (31255651663) 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, 12391940 + ... + 12394461.

It is an arithmetic number, because the mean of its divisors is an integer number (4250867943).

Almost surely, 2^31255651661 is an apocalyptic number.

It is an amenable number.

31255651661 is a deficient number, since it is larger than the sum of its proper divisors (2751291883).

31255651661 is a wasteful number, since it uses less digits than its factorization.

31255651661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24786511.

The product of its digits is 162000, while the sum is 41.

The spelling of 31255651661 in words is "thirty-one billion, two hundred fifty-five million, six hundred fifty-one thousand, six hundred sixty-one".