16461637481 has 4 divisors (see below), whose sum is σ = 16475098752. Its totient is φ = 16448176212.

The previous prime is 16461637447. The next prime is 16461637499. The reversal of 16461637481 is 18473616461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16461637481 is a prime.

It is a super-2 number, since 2×16461637481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16461637781) 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, 6728801 + ... + 6731246.

It is an arithmetic number, because the mean of its divisors is an integer number (4118774688).

Almost surely, 2^16461637481 is an apocalyptic number.

It is an amenable number.

16461637481 is a deficient number, since it is larger than the sum of its proper divisors (13461271).

16461637481 is a wasteful number, since it uses less digits than its factorization.

16461637481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13461270.

The product of its digits is 580608, while the sum is 47.

The spelling of 16461637481 in words is "sixteen billion, four hundred sixty-one million, six hundred thirty-seven thousand, four hundred eighty-one".