16615707481 has 2 divisors, whose sum is σ = 16615707482. Its totient is φ = 16615707480.

The previous prime is 16615707457. The next prime is 16615707497. The reversal of 16615707481 is 18470751661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11646726400 + 4968981081 = 107920^2 + 70491^2 .

It is an emirp because it is prime and its reverse (18470751661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16615707481 - 2²¹ = 16613610329 is a prime.

It is a super-2 number, since 2×16615707481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16615707431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8307853740 + 8307853741.

It is an arithmetic number, because the mean of its divisors is an integer number (8307853741).

Almost surely, 2^16615707481 is an apocalyptic number.

It is an amenable number.

16615707481 is a deficient number, since it is larger than the sum of its proper divisors (1).

16615707481 is an equidigital number, since it uses as much as digits as its factorization.

16615707481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 16615707481 in words is "sixteen billion, six hundred fifteen million, seven hundred seven thousand, four hundred eighty-one".