16615707457 has 2 divisors, whose sum is σ = 16615707458. Its totient is φ = 16615707456.

The previous prime is 16615707439. The next prime is 16615707481. The reversal of 16615707457 is 75470751661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16199180176 + 416527281 = 127276^2 + 20409^2 .

It is an emirp because it is prime and its reverse (75470751661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16615707457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16615707457.

It is not a weakly prime, because it can be changed into another prime (16615707497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8307853728 + 8307853729.

It is an arithmetic number, because the mean of its divisors is an integer number (8307853729).

Almost surely, 2^16615707457 is an apocalyptic number.

It is an amenable number.

16615707457 is a deficient number, since it is larger than the sum of its proper divisors (1).

16615707457 is an equidigital number, since it uses as much as digits as its factorization.

16615707457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234800, while the sum is 49.

The spelling of 16615707457 in words is "sixteen billion, six hundred fifteen million, seven hundred seven thousand, four hundred fifty-seven".