16607656081 has 2 divisors, whose sum is σ = 16607656082. Its totient is φ = 16607656080.

The previous prime is 16607656061. The next prime is 16607656111. The reversal of 16607656081 is 18065670661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13657428225 + 2950227856 = 116865^2 + 54316^2 .

It is a cyclic number.

It is not a de Polignac number, because 16607656081 - 2¹⁷ = 16607525009 is a prime.

It is a super-2 number, since 2×16607656081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16607656061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8303828040 + 8303828041.

It is an arithmetic number, because the mean of its divisors is an integer number (8303828041).

Almost surely, 2^16607656081 is an apocalyptic number.

It is an amenable number.

16607656081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16607656081 is an equidigital number, since it uses as much as digits as its factorization.

16607656081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

It can be divided in two parts, 1660 and 7656081, that added together give a triangular number (7657741 = T₃₉₁₃).

The spelling of 16607656081 in words is "sixteen billion, six hundred seven million, six hundred fifty-six thousand, eighty-one".