18945001253 has 8 divisors (see below), whose sum is σ = 19131892416. Its totient is φ = 18758167200.

The previous prime is 18945001211. The next prime is 18945001267. The reversal of 18945001253 is 35210054981.

It is a happy number.

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 18945001253 - 2²⁶ = 18877892389 is a prime.

It is a super-3 number, since 3×18945001253³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18945001853) 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, 1013633 + ... + 1032153.

It is an arithmetic number, because the mean of its divisors is an integer number (2391486552).

Almost surely, 2^18945001253 is an apocalyptic number.

It is an amenable number.

18945001253 is a deficient number, since it is larger than the sum of its proper divisors (186891163).

18945001253 is a wasteful number, since it uses less digits than its factorization.

18945001253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28555.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 18945001253 in words is "eighteen billion, nine hundred forty-five million, one thousand, two hundred fifty-three".