1800898136478 has 48 divisors (see below), whose sum is σ = 4520454053856. Its totient is φ = 507493797120.

The previous prime is 1800898136461. The next prime is 1800898136573. The reversal of 1800898136478 is 8746318980081.

1800898136478 is a `hidden beast` number, since 1 + 8 + 0 + 0 + 89 + 81 + 3 + 6 + 478 = 666.

It is a super-2 number, since 2×1800898136478² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97886983 + ... + 97905378.

It is an arithmetic number, because the mean of its divisors is an integer number (94176126122).

Almost surely, 2^{1800898136478} is an apocalyptic number.

1800898136478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1800898136478 is an abundant number, since it is smaller than the sum of its proper divisors (2719555917378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1800898136478 is a wasteful number, since it uses less digits than its factorization.

1800898136478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195792449 (or 195792446 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 63.

The spelling of 1800898136478 in words is "one trillion, eight hundred billion, eight hundred ninety-eight million, one hundred thirty-six thousand, four hundred seventy-eight".