31616144465 has 4 divisors (see below), whose sum is σ = 37939373364. Its totient is φ = 25292915568.

The previous prime is 31616144429. The next prime is 31616144489. The reversal of 31616144465 is 56444161613.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23328591169 + 8287553296 = 152737^2 + 91036^2 .

It is a cyclic number.

It is not a de Polignac number, because 31616144465 - 2¹⁶ = 31616078929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3161614442 + ... + 3161614451.

It is an arithmetic number, because the mean of its divisors is an integer number (9484843341).

Almost surely, 2^31616144465 is an apocalyptic number.

It is an amenable number.

31616144465 is a deficient number, since it is larger than the sum of its proper divisors (6323228899).

31616144465 is an equidigital number, since it uses as much as digits as its factorization.

31616144465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6323228898.

The product of its digits is 207360, while the sum is 41.

The spelling of 31616144465 in words is "thirty-one billion, six hundred sixteen million, one hundred forty-four thousand, four hundred sixty-five".