18120401571 has 8 divisors (see below), whose sum is σ = 24813523024. Its totient is φ = 11753773920.

The previous prime is 18120401549. The next prime is 18120401599. The reversal of 18120401571 is 17510402181.

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

It is not a de Polignac number, because 18120401571 - 2⁹ = 18120401059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18120401671) 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, 81623320 + ... + 81623541.

It is an arithmetic number, because the mean of its divisors is an integer number (3101690378).

Almost surely, 2^18120401571 is an apocalyptic number.

18120401571 is a deficient number, since it is larger than the sum of its proper divisors (6693121453).

18120401571 is a wasteful number, since it uses less digits than its factorization.

18120401571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163246901.

The product of its (nonzero) digits is 2240, while the sum is 30.

The spelling of 18120401571 in words is "eighteen billion, one hundred twenty million, four hundred one thousand, five hundred seventy-one".