18257401081 has 4 divisors (see below), whose sum is σ = 19051201152. Its totient is φ = 17463601012.

The previous prime is 18257401079. The next prime is 18257401109. The reversal of 18257401081 is 18010475281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18257401081 - 2¹ = 18257401079 is a prime.

It is a super-4 number, since 4×18257401081⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18257401081.

It is not an unprimeable number, because it can be changed into a prime (18257401181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396900001 + ... + 396900046.

It is an arithmetic number, because the mean of its divisors is an integer number (4762800288).

Almost surely, 2^18257401081 is an apocalyptic number.

It is an amenable number.

18257401081 is a deficient number, since it is larger than the sum of its proper divisors (793800071).

18257401081 is an equidigital number, since it uses as much as digits as its factorization.

18257401081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793800070.

The product of its (nonzero) digits is 17920, while the sum is 37.

The spelling of 18257401081 in words is "eighteen billion, two hundred fifty-seven million, four hundred one thousand, eighty-one".