19957475991 has 8 divisors (see below), whose sum is σ = 27329156464. Its totient is φ = 12945389760.

The previous prime is 19957475977. The next prime is 19957476001.

It is a happy number.

19957475991 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 19957475991 - 2¹³ = 19957467799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19957475971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89898430 + ... + 89898651.

It is an arithmetic number, because the mean of its divisors is an integer number (3416144558).

Almost surely, 2^19957475991 is an apocalyptic number.

19957475991 is a deficient number, since it is larger than the sum of its proper divisors (7371680473).

19957475991 is a wasteful number, since it uses less digits than its factorization.

19957475991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179797121.

The product of its digits is 32148900, while the sum is 66.

The spelling of 19957475991 in words is "nineteen billion, nine hundred fifty-seven million, four hundred seventy-five thousand, nine hundred ninety-one".