1951653442517 has 2 divisors, whose sum is σ = 1951653442518. Its totient is φ = 1951653442516.

The previous prime is 1951653442499. The next prime is 1951653442573. The reversal of 1951653442517 is 7152443561591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1422941222641 + 528712219876 = 1192871^2 + 727126^2 .

It is an emirp because it is prime and its reverse (7152443561591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1951653442517 - 2²⁴ = 1951636665301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1951653442597) 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 as a sum of consecutive naturals, namely, 975826721258 + 975826721259.

It is an arithmetic number, because the mean of its divisors is an integer number (975826721259).

Almost surely, 2^{1951653442517} is an apocalyptic number.

It is an amenable number.

1951653442517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951653442517 is an equidigital number, since it uses as much as digits as its factorization.

1951653442517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536000, while the sum is 53.

The spelling of 1951653442517 in words is "one trillion, nine hundred fifty-one billion, six hundred fifty-three million, four hundred forty-two thousand, five hundred seventeen".