19722179801 has 2 divisors, whose sum is σ = 19722179802. Its totient is φ = 19722179800.

The previous prime is 19722179773. The next prime is 19722179833. The reversal of 19722179801 is 10897122791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13934622025 + 5787557776 = 118045^2 + 76076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19722179801 is a prime.

It is a super-2 number, since 2×19722179801² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19722179861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9861089900 + 9861089901.

It is an arithmetic number, because the mean of its divisors is an integer number (9861089901).

Almost surely, 2^19722179801 is an apocalyptic number.

It is an amenable number.

19722179801 is a deficient number, since it is larger than the sum of its proper divisors (1).

19722179801 is an equidigital number, since it uses as much as digits as its factorization.

19722179801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 47.

The spelling of 19722179801 in words is "nineteen billion, seven hundred twenty-two million, one hundred seventy-nine thousand, eight hundred one".