16662001007537 has 2 divisors, whose sum is σ = 16662001007538. Its totient is φ = 16662001007536.

The previous prime is 16662001007429. The next prime is 16662001007611. The reversal of 16662001007537 is 73570010026661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12489148932001 + 4172852075536 = 3533999^2 + 2042756^2 .

It is an emirp because it is prime and its reverse (73570010026661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16662001007537 - 2¹⁸ = 16662000745393 is a prime.

It is not a weakly prime, because it can be changed into another prime (16662001001537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331000503768 + 8331000503769.

It is an arithmetic number, because the mean of its divisors is an integer number (8331000503769).

Almost surely, 2^{16662001007537} is an apocalyptic number.

It is an amenable number.

16662001007537 is a deficient number, since it is larger than the sum of its proper divisors (1).

16662001007537 is an equidigital number, since it uses as much as digits as its factorization.

16662001007537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 16662001007537 in words is "sixteen trillion, six hundred sixty-two billion, one million, seven thousand, five hundred thirty-seven".