316540121016661 has 16 divisors (see below), whose sum is σ = 320826990959280. Its totient is φ = 312280281026560.

The previous prime is 316540121016641. The next prime is 316540121016667. The reversal of 316540121016661 is 166610121045613.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7304554857636 + 309235566159025 = 2702694^2 + 17585095^2 .

It is a cyclic number.

It is not a de Polignac number, because 316540121016661 - 2⁵ = 316540121016629 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 (316540121016667) 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, 71276241 + ... + 75586921.

It is an arithmetic number, because the mean of its divisors is an integer number (20051686934955).

Almost surely, 2^{316540121016661} is an apocalyptic number.

It is an amenable number.

316540121016661 is a deficient number, since it is larger than the sum of its proper divisors (4286869942619).

316540121016661 is a wasteful number, since it uses less digits than its factorization.

316540121016661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4313816.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 316540121016661 in words is "three hundred sixteen trillion, five hundred forty billion, one hundred twenty-one million, sixteen thousand, six hundred sixty-one".