126199720516 has 9 divisors (see below), whose sum is σ = 220850754271. Its totient is φ = 63099505012.

The previous prime is 126199720477. The next prime is 126199720523. The reversal of 126199720516 is 615027991621.

It is a happy number.

The square root of 126199720516 is 355246.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×126199720516² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126199720516.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 621681 + ... + 799303.

Almost surely, 2^126199720516 is an apocalyptic number.

126199720516 is the 355246-th square number.

It is an amenable number.

126199720516 is a deficient number, since it is larger than the sum of its proper divisors (94651033755).

126199720516 is an frugal number, since it uses more digits than its factorization.

126199720516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355250 (or 177625 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 49.

Multiplying 126199720516 by its sum of digits (49), we get a square (6183786305284 = 2486722²).

The spelling of 126199720516 in words is "one hundred twenty-six billion, one hundred ninety-nine million, seven hundred twenty thousand, five hundred sixteen".