19724049613 has 2 divisors, whose sum is σ = 19724049614. Its totient is φ = 19724049612.

The previous prime is 19724049607. The next prime is 19724049617. The reversal of 19724049613 is 31694042791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19723955364 + 94249 = 140442^2 + 307^2 .

It is a cyclic number.

It is not a de Polignac number, because 19724049613 - 2¹⁷ = 19723918541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19724049617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9862024806 + 9862024807.

It is an arithmetic number, because the mean of its divisors is an integer number (9862024807).

Almost surely, 2^19724049613 is an apocalyptic number.

It is an amenable number.

19724049613 is a deficient number, since it is larger than the sum of its proper divisors (1).

19724049613 is an equidigital number, since it uses as much as digits as its factorization.

19724049613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 19724049613 in words is "nineteen billion, seven hundred twenty-four million, forty-nine thousand, six hundred thirteen".