18402098077440 has 864 divisors, whose sum is σ = 83557928563200. Its totient is φ = 3622555975680.

The previous prime is 18402098077427. The next prime is 18402098077481. The reversal of 18402098077440 is 4477089020481.

18402098077440 is a `hidden beast` number, since 1 + 8 + 40 + 2 + 0 + 98 + 0 + 77 + 440 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16307826 + ... + 17399694.

Almost surely, 2^{18402098077440} is an apocalyptic number.

18402098077440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18402098077440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41778964281600).

18402098077440 is an abundant number, since it is smaller than the sum of its proper divisors (65155830485760).

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

18402098077440 is a wasteful number, since it uses less digits than its factorization.

18402098077440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091933 (or 1091916 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 18402098077440 in words is "eighteen trillion, four hundred two billion, ninety-eight million, seventy-seven thousand, four hundred forty".