16312636537 has 4 divisors (see below), whose sum is σ = 16315642276. Its totient is φ = 16309630800.

The previous prime is 16312636519. The next prime is 16312636577. The reversal of 16312636537 is 73563621361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73563621361 = 199 ⋅369666439.

It can be written as a sum of positive squares in 2 ways, for example, as 10802692096 + 5509944441 = 103936^2 + 74229^2 .

It is a cyclic number.

It is not a de Polignac number, because 16312636537 - 2¹⁹ = 16312112249 is a prime.

It is a super-2 number, since 2×16312636537² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16312636493 and 16312636502.

It is not an unprimeable number, because it can be changed into a prime (16312636577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1494714 + ... + 1505587.

It is an arithmetic number, because the mean of its divisors is an integer number (4078910569).

Almost surely, 2^16312636537 is an apocalyptic number.

It is an amenable number.

16312636537 is a deficient number, since it is larger than the sum of its proper divisors (3005739).

16312636537 is an equidigital number, since it uses as much as digits as its factorization.

16312636537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005738.

The product of its digits is 408240, while the sum is 43.

The spelling of 16312636537 in words is "sixteen billion, three hundred twelve million, six hundred thirty-six thousand, five hundred thirty-seven".