31485511665 has 12 divisors (see below), whose sum is σ = 54574886964. Its totient is φ = 16792272864.

The previous prime is 31485511663. The next prime is 31485511703. The reversal of 31485511665 is 56611558413.

It is a happy number.

31485511665 is a `hidden beast` number, since 3 + 1 + 485 + 5 + 1 + 166 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9069133824 + 22416377841 = 95232^2 + 149721^2 .

It is not a de Polignac number, because 31485511665 - 2¹ = 31485511663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 699678037 = 31485511665 / (3 + 1 + 4 + 8 + 5 + 5 + 1 + 1 + 6 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 31485511665.

It is not an unprimeable number, because it can be changed into a prime (31485511663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 349838974 + ... + 349839063.

It is an arithmetic number, because the mean of its divisors is an integer number (4547907247).

Almost surely, 2^31485511665 is an apocalyptic number.

It is an amenable number.

31485511665 is a deficient number, since it is larger than the sum of its proper divisors (23089375299).

31485511665 is a wasteful number, since it uses less digits than its factorization.

31485511665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699678048 (or 699678045 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The spelling of 31485511665 in words is "thirty-one billion, four hundred eighty-five million, five hundred eleven thousand, six hundred sixty-five".