19957111945 has 8 divisors (see below), whose sum is σ = 23951211336. Its totient is φ = 15963904896.

The previous prime is 19957111939. The next prime is 19957111949. The reversal of 19957111945 is 54911175991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 803382336 + 19153729609 = 28344^2 + 138397^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19957111945 - 2¹³ = 19957103753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19957111892 and 19957111901.

It is not an unprimeable number, because it can be changed into a prime (19957111949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172852 + ... + 264181.

It is an arithmetic number, because the mean of its divisors is an integer number (2993901417).

Almost surely, 2^19957111945 is an apocalyptic number.

It is an amenable number.

19957111945 is a deficient number, since it is larger than the sum of its proper divisors (3994099391).

19957111945 is an equidigital number, since it uses as much as digits as its factorization.

19957111945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446171.

The product of its digits is 510300, while the sum is 52.

The spelling of 19957111945 in words is "nineteen billion, nine hundred fifty-seven million, one hundred eleven thousand, nine hundred forty-five".