19702432891445 has 4 divisors (see below), whose sum is σ = 23642919469740. Its totient is φ = 15761946313152.

The previous prime is 19702432891433. The next prime is 19702432891451. The reversal of 19702432891445 is 54419823420791.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14211738863716 + 5490694027729 = 3769846^2 + 2343223^2 .

It is a cyclic number.

It is not a de Polignac number, because 19702432891445 - 2¹² = 19702432887349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1970243289140 + ... + 1970243289149.

It is an arithmetic number, because the mean of its divisors is an integer number (5910729867435).

Almost surely, 2^{19702432891445} is an apocalyptic number.

It is an amenable number.

19702432891445 is a deficient number, since it is larger than the sum of its proper divisors (3940486578295).

19702432891445 is an equidigital number, since it uses as much as digits as its factorization.

19702432891445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940486578294.

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 19702432891445 in words is "nineteen trillion, seven hundred two billion, four hundred thirty-two million, eight hundred ninety-one thousand, four hundred forty-five".