19749651507364 has 27 divisors (see below), whose sum is σ = 34608444252291. Its totient is φ = 9861542464320.

The previous prime is 19749651507347. The next prime is 19749651507371. The reversal of 19749651507364 is 46370515694791.

The square root of 19749651507364 is 4444058.

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

It can be written as a sum of positive squares in 4 ways, for example, as 6114947556964 + 13634703950400 = 2472842^2 + 3692520^2 .

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 19749651507364.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12274487392 + ... + 12274489000.

Almost surely, 2^{19749651507364} is an apocalyptic number.

19749651507364 is the 4444058-th square number.

It is an amenable number.

19749651507364 is a deficient number, since it is larger than the sum of its proper divisors (14858792744927).

19749651507364 is an frugal number, since it uses more digits than its factorization.

19749651507364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5984 (or 2992 counting only the distinct ones).

The product of its (nonzero) digits is 171460800, while the sum is 67.

The spelling of 19749651507364 in words is "nineteen trillion, seven hundred forty-nine billion, six hundred fifty-one million, five hundred seven thousand, three hundred sixty-four".