19951346971393 has 2 divisors, whose sum is σ = 19951346971394. Its totient is φ = 19951346971392.

The previous prime is 19951346971373. The next prime is 19951346971399. The reversal of 19951346971393 is 39317964315991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12044835301489 + 7906511669904 = 3470567^2 + 2811852^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19951346971393 is a prime.

It is not a weakly prime, because it can be changed into another prime (19951346971399) by changing a digit.

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, 9975673485696 + 9975673485697.

It is an arithmetic number, because the mean of its divisors is an integer number (9975673485697).

Almost surely, 2^{19951346971393} is an apocalyptic number.

It is an amenable number.

19951346971393 is a deficient number, since it is larger than the sum of its proper divisors (1).

19951346971393 is an equidigital number, since it uses as much as digits as its factorization.

19951346971393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148803480, while the sum is 70.

The spelling of 19951346971393 in words is "nineteen trillion, nine hundred fifty-one billion, three hundred forty-six million, nine hundred seventy-one thousand, three hundred ninety-three".