19857488401 has 8 divisors (see below), whose sum is σ = 21042874440. Its totient is φ = 18674024448.

The previous prime is 19857488377. The next prime is 19857488407. The reversal of 19857488401 is 10488475891.

It can be written as a sum of positive squares in 4 ways, for example, as 3772907776 + 16084580625 = 61424^2 + 126825^2 .

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 19857488401 - 2²¹ = 19855391249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19857488407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459216 + ... + 500593.

It is an arithmetic number, because the mean of its divisors is an integer number (2630359305).

Almost surely, 2^19857488401 is an apocalyptic number.

It is an amenable number.

19857488401 is a deficient number, since it is larger than the sum of its proper divisors (1185386039).

19857488401 is a wasteful number, since it uses less digits than its factorization.

19857488401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961043.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 19857488401 in words is "nineteen billion, eight hundred fifty-seven million, four hundred eighty-eight thousand, four hundred one".