19441691957 has 2 divisors, whose sum is σ = 19441691958. Its totient is φ = 19441691956.

The previous prime is 19441691947. The next prime is 19441692071. The reversal of 19441691957 is 75919614491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18052340881 + 1389351076 = 134359^2 + 37274^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19441691957 is a prime.

It is a super-3 number, since 3×19441691957³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19441691947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9720845978 + 9720845979.

It is an arithmetic number, because the mean of its divisors is an integer number (9720845979).

Almost surely, 2^19441691957 is an apocalyptic number.

It is an amenable number.

19441691957 is a deficient number, since it is larger than the sum of its proper divisors (1).

19441691957 is an equidigital number, since it uses as much as digits as its factorization.

19441691957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 56.

The spelling of 19441691957 in words is "nineteen billion, four hundred forty-one million, six hundred ninety-one thousand, nine hundred fifty-seven".