19701193669 has 2 divisors, whose sum is σ = 19701193670. Its totient is φ = 19701193668.

The previous prime is 19701193667. The next prime is 19701193709. The reversal of 19701193669 is 96639110791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11889285444 + 7811908225 = 109038^2 + 88385^2 .

It is a cyclic number.

It is not a de Polignac number, because 19701193669 - 2¹ = 19701193667 is a prime.

It is a super-2 number, since 2×19701193669² (a number of 21 digits) contains 22 as substring.

Together with 19701193667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19701193667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9850596834 + 9850596835.

It is an arithmetic number, because the mean of its divisors is an integer number (9850596835).

Almost surely, 2^19701193669 is an apocalyptic number.

It is an amenable number.

19701193669 is a deficient number, since it is larger than the sum of its proper divisors (1).

19701193669 is an equidigital number, since it uses as much as digits as its factorization.

19701193669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551124, while the sum is 52.

The spelling of 19701193669 in words is "nineteen billion, seven hundred one million, one hundred ninety-three thousand, six hundred sixty-nine".