19961075626679 has 4 divisors (see below), whose sum is σ = 21775718865480. Its totient is φ = 18146432387880.

The previous prime is 19961075626673. The next prime is 19961075626693. The reversal of 19961075626679 is 97662657016991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19961075626679 - 2²⁴ = 19961058849463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19961075626673) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 907321619384 + ... + 907321619405.

It is an arithmetic number, because the mean of its divisors is an integer number (5443929716370).

Almost surely, 2^{19961075626679} is an apocalyptic number.

19961075626679 is a deficient number, since it is larger than the sum of its proper divisors (1814643238801).

19961075626679 is a wasteful number, since it uses less digits than its factorization.

19961075626679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814643238800.

The product of its (nonzero) digits is 462944160, while the sum is 74.

The spelling of 19961075626679 in words is "nineteen trillion, nine hundred sixty-one billion, seventy-five million, six hundred twenty-six thousand, six hundred seventy-nine".