19956250457 has 8 divisors (see below), whose sum is σ = 23445105600. Its totient is φ = 16746503760.

The previous prime is 19956250453. The next prime is 19956250459. The reversal of 19956250457 is 75405265991.

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 19956250457 - 2² = 19956250453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19956250399 and 19956250408.

It is not an unprimeable number, because it can be changed into a prime (19956250451) 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, 69776957 + ... + 69777242.

It is an arithmetic number, because the mean of its divisors is an integer number (2930638200).

Almost surely, 2^19956250457 is an apocalyptic number.

It is an amenable number.

19956250457 is a deficient number, since it is larger than the sum of its proper divisors (3488855143).

19956250457 is a wasteful number, since it uses less digits than its factorization.

19956250457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139554223.

The product of its (nonzero) digits is 3402000, while the sum is 53.

The spelling of 19956250457 in words is "nineteen billion, nine hundred fifty-six million, two hundred fifty thousand, four hundred fifty-seven".