19522140643 has 2 divisors, whose sum is σ = 19522140644. Its totient is φ = 19522140642.

The previous prime is 19522140619. The next prime is 19522140667. The reversal of 19522140643 is 34604122591.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (19522140619) and next prime (19522140667).

It is a cyclic number.

It is not a de Polignac number, because 19522140643 - 2¹⁷ = 19522009571 is a prime.

It is a super-2 number, since 2×19522140643² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19522140943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9761070321 + 9761070322.

It is an arithmetic number, because the mean of its divisors is an integer number (9761070322).

Almost surely, 2^19522140643 is an apocalyptic number.

19522140643 is a deficient number, since it is larger than the sum of its proper divisors (1).

19522140643 is an equidigital number, since it uses as much as digits as its factorization.

19522140643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 19522140643 in words is "nineteen billion, five hundred twenty-two million, one hundred forty thousand, six hundred forty-three".