16298607557 has 8 divisors (see below), whose sum is σ = 17328960792. Its totient is φ = 15276211200.

The previous prime is 16298607509. The next prime is 16298607587. The reversal of 16298607557 is 75570689261.

It is a Cunningham number, because it is equal to 127666²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 4593315076 + 11705292481 = 67774^2 + 108191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16298607557 - 2⁸ = 16298607301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16298607587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1984994 + ... + 1993187.

It is an arithmetic number, because the mean of its divisors is an integer number (2166120099).

Almost surely, 2^16298607557 is an apocalyptic number.

16298607557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16298607557 is a deficient number, since it is larger than the sum of its proper divisors (1030353235).

16298607557 is a wasteful number, since it uses less digits than its factorization.

16298607557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978439.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 16298607557 in words is "sixteen billion, two hundred ninety-eight million, six hundred seven thousand, five hundred fifty-seven".