646616126 has 16 divisors (see below), whose sum is σ = 1051457568. Its totient is φ = 296460000.

The previous prime is 646616123. The next prime is 646616137. The reversal of 646616126 is 621616646.

It is a super-2 number, since 2×646616126² = 836224828806495752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646616126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646616123) 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, 78425 + ... + 86276.

It is an arithmetic number, because the mean of its divisors is an integer number (65716098).

Almost surely, 2^646616126 is an apocalyptic number.

646616126 is a deficient number, since it is larger than the sum of its proper divisors (404841442).

646616126 is a wasteful number, since it uses less digits than its factorization.

646616126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164867.

The product of its digits is 62208, while the sum is 38.

The square root of 646616126 is about 25428.6477422611. The cubic root of 646616126 is about 864.7332871894.

The spelling of 646616126 in words is "six hundred forty-six million, six hundred sixteen thousand, one hundred twenty-six".