19797975739 has 2 divisors, whose sum is σ = 19797975740. Its totient is φ = 19797975738.

The previous prime is 19797975727. The next prime is 19797975767. The reversal of 19797975739 is 93757979791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19797975739 - 2⁵ = 19797975707 is a prime.

It is a super-4 number, since 4×19797975739⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (19797975539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9898987869 + 9898987870.

It is an arithmetic number, because the mean of its divisors is an integer number (9898987870).

Almost surely, 2^19797975739 is an apocalyptic number.

19797975739 is a deficient number, since it is larger than the sum of its proper divisors (1).

19797975739 is an equidigital number, since it uses as much as digits as its factorization.

19797975739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 236294415, while the sum is 73.

The spelling of 19797975739 in words is "nineteen billion, seven hundred ninety-seven million, nine hundred seventy-five thousand, seven hundred thirty-nine".