18075948747491 has 4 divisors (see below), whose sum is σ = 18323564483832. Its totient is φ = 17828333011152.

The previous prime is 18075948747487. The next prime is 18075948747499. The reversal of 18075948747491 is 19474784957081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18075948747491 - 2² = 18075948747487 is a prime.

It is a super-3 number, since 3×18075948747491³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18075948747499) 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, 123807868061 + ... + 123807868206.

It is an arithmetic number, because the mean of its divisors is an integer number (4580891120958).

Almost surely, 2^{18075948747491} is an apocalyptic number.

18075948747491 is a deficient number, since it is larger than the sum of its proper divisors (247615736341).

18075948747491 is an equidigital number, since it uses as much as digits as its factorization.

18075948747491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247615736340.

The product of its (nonzero) digits is 568995840, while the sum is 74.

The spelling of 18075948747491 in words is "eighteen trillion, seventy-five billion, nine hundred forty-eight million, seven hundred forty-seven thousand, four hundred ninety-one".