1918073291903 has 8 divisors (see below), whose sum is σ = 1924924080528. Its totient is φ = 1911223018944.

The previous prime is 1918073291879. The next prime is 1918073291921. The reversal of 1918073291903 is 3091923708191.

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 1918073291903 - 2⁸ = 1918073291647 is a prime.

It is a super-2 number, since 2×1918073291903² (a number of 25 digits) contains 22 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 (1918073294903) 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, 8306201 + ... + 8533997.

It is an arithmetic number, because the mean of its divisors is an integer number (240615510066).

Almost surely, 2^{1918073291903} is an apocalyptic number.

1918073291903 is a deficient number, since it is larger than the sum of its proper divisors (6850788625).

1918073291903 is a wasteful number, since it uses less digits than its factorization.

1918073291903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257833.

The product of its (nonzero) digits is 734832, while the sum is 53.

The spelling of 1918073291903 in words is "one trillion, nine hundred eighteen billion, seventy-three million, two hundred ninety-one thousand, nine hundred three".