19475399861 has 2 divisors, whose sum is σ = 19475399862. Its totient is φ = 19475399860.

The previous prime is 19475399849. The next prime is 19475399863. The reversal of 19475399861 is 16899357491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12372112900 + 7103286961 = 111230^2 + 84281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19475399861 is a prime.

It is a super-3 number, since 3×19475399861³ (a number of 32 digits) contains 333 as substring.

Together with 19475399863, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19475399794 and 19475399803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19475399863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9737699930 + 9737699931.

It is an arithmetic number, because the mean of its divisors is an integer number (9737699931).

Almost surely, 2^19475399861 is an apocalyptic number.

It is an amenable number.

19475399861 is a deficient number, since it is larger than the sum of its proper divisors (1).

19475399861 is an equidigital number, since it uses as much as digits as its factorization.

19475399861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 62.

The spelling of 19475399861 in words is "nineteen billion, four hundred seventy-five million, three hundred ninety-nine thousand, eight hundred sixty-one".