3181970980865 has 16 divisors (see below), whose sum is σ = 3857825134800. Its totient is φ = 2519271444480.

The previous prime is 3181970980847. The next prime is 3181970980871. The reversal of 3181970980865 is 5680890791813.

It is a Cunningham number, because it is equal to 1783808²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 88111610896 + 3093859369969 = 296836^2 + 1758937^2 .

It is not a de Polignac number, because 3181970980865 - 2¹⁰ = 3181970979841 is a prime.

It is a super-2 number, since 2×3181970980865² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37370861 + ... + 37455909.

It is an arithmetic number, because the mean of its divisors is an integer number (241114070925).

It is a Proth number, since it is equal to 758641 ⋅ 2²² + 1 and 758641 < 2²².

Almost surely, 2^{3181970980865} is an apocalyptic number.

It is an amenable number.

3181970980865 is a deficient number, since it is larger than the sum of its proper divisors (675854153935).

3181970980865 is an equidigital number, since it uses as much as digits as its factorization.

3181970980865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162292.

The product of its (nonzero) digits is 26127360, while the sum is 65.

The spelling of 3181970980865 in words is "three trillion, one hundred eighty-one billion, nine hundred seventy million, nine hundred eighty thousand, eight hundred sixty-five".