16617251986 has 4 divisors (see below), whose sum is σ = 24925877982. Its totient is φ = 8308625992.

The previous prime is 16617251957. The next prime is 16617252007. The reversal of 16617251986 is 68915271661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68915271661 = 13229 ⋅5209409.

It can be written as a sum of positive squares in only one way, i.e., 10543387761 + 6073864225 = 102681^2 + 77935^2 .

It is a super-2 number, since 2×16617251986² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 4154312995 + ... + 4154312998.

Almost surely, 2^16617251986 is an apocalyptic number.

16617251986 is a deficient number, since it is larger than the sum of its proper divisors (8308625996).

16617251986 is an equidigital number, since it uses as much as digits as its factorization.

16617251986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8308625995.

The product of its digits is 1088640, while the sum is 52.

The spelling of 16617251986 in words is "sixteen billion, six hundred seventeen million, two hundred fifty-one thousand, nine hundred eighty-six".