16607685557 has 2 divisors, whose sum is σ = 16607685558. Its totient is φ = 16607685556.

The previous prime is 16607685553. The next prime is 16607685559. The reversal of 16607685557 is 75558670661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16476032881 + 131652676 = 128359^2 + 11474^2 .

It is a cyclic number.

It is not a de Polignac number, because 16607685557 - 2² = 16607685553 is a prime.

Together with 16607685559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16607685553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8303842778 + 8303842779.

It is an arithmetic number, because the mean of its divisors is an integer number (8303842779).

Almost surely, 2^16607685557 is an apocalyptic number.

It is an amenable number.

16607685557 is a deficient number, since it is larger than the sum of its proper divisors (1).

16607685557 is an equidigital number, since it uses as much as digits as its factorization.

16607685557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584000, while the sum is 56.

The spelling of 16607685557 in words is "sixteen billion, six hundred seven million, six hundred eighty-five thousand, five hundred fifty-seven".