19951346971648 has 22 divisors (see below), whose sum is σ = 39883210208066. Its totient is φ = 9975673485312.

The previous prime is 19951346971639. The next prime is 19951346971651. The reversal of 19951346971648 is 84617964315991.

It can be written as a sum of positive squares in only one way, i.e., 19406773817344 + 544573154304 = 4405312^2 + 737952^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 9741867615 + ... + 9741869662.

Almost surely, 2^{19951346971648} is an apocalyptic number.

It is an amenable number.

19951346971648 is a deficient number, since it is larger than the sum of its proper divisors (19931863236418).

19951346971648 is an equidigital number, since it uses as much as digits as its factorization.

19951346971648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19483737297 (or 19483737279 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 73.

The spelling of 19951346971648 in words is "nineteen trillion, nine hundred fifty-one billion, three hundred forty-six million, nine hundred seventy-one thousand, six hundred forty-eight".