31661531754073 has 16 divisors (see below), whose sum is σ = 35274294190800. Its totient is φ = 28217035042560.

The previous prime is 31661531754067. The next prime is 31661531754079. The reversal of 31661531754073 is 37045713516613.

It is an interprime number because it is at equal distance from previous prime (31661531754067) and next prime (31661531754079).

It can be written as a sum of positive squares in 8 ways, for example, as 5287226563609 + 26374305190464 = 2299397^2 + 5135592^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31661531754073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31661531754073.

It is not an unprimeable number, because it can be changed into a prime (31661531754079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7149103 + ... + 10697323.

It is an arithmetic number, because the mean of its divisors is an integer number (2204643386925).

Almost surely, 2^{31661531754073} is an apocalyptic number.

It is an amenable number.

31661531754073 is a deficient number, since it is larger than the sum of its proper divisors (3612762436727).

31661531754073 is a wasteful number, since it uses less digits than its factorization.

31661531754073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571932.

The product of its (nonzero) digits is 4762800, while the sum is 52.

The spelling of 31661531754073 in words is "thirty-one trillion, six hundred sixty-one billion, five hundred thirty-one million, seven hundred fifty-four thousand, seventy-three".