19951346971651 has 2 divisors, whose sum is σ = 19951346971652. Its totient is φ = 19951346971650.

The previous prime is 19951346971639. The next prime is 19951346971667. The reversal of 19951346971651 is 15617964315991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19951346971651 - 2⁴³ = 11155253949443 is a prime.

It is not a weakly prime, because it can be changed into another prime (19951346971151) 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, 9975673485825 + 9975673485826.

It is an arithmetic number, because the mean of its divisors is an integer number (9975673485826).

Almost surely, 2^{19951346971651} is an apocalyptic number.

19951346971651 is a deficient number, since it is larger than the sum of its proper divisors (1).

19951346971651 is an equidigital number, since it uses as much as digits as its factorization.

19951346971651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55112400, while the sum is 67.

The spelling of 19951346971651 in words is "nineteen trillion, nine hundred fifty-one billion, three hundred forty-six million, nine hundred seventy-one thousand, six hundred fifty-one".