1318155171840 has 2016 divisors, whose sum is σ = 5540295983040. Its totient is φ = 298885054464.

The previous prime is 1318155171833. The next prime is 1318155171859. The reversal of 1318155171840 is 481715518131.

1318155171840 is a `hidden beast` number, since 1 + 3 + 1 + 81 + 5 + 517 + 18 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 28045854697 + ... + 28045854743.

It is an arithmetic number, because the mean of its divisors is an integer number (2748162690).

Almost surely, 2^{1318155171840} is an apocalyptic number.

1318155171840 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 1318155171840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2770147991520).

1318155171840 is an abundant number, since it is smaller than the sum of its proper divisors (4222140811200).

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

1318155171840 is an equidigital number, since it uses as much as digits as its factorization.

1318155171840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 45.

The spelling of 1318155171840 in words is "one trillion, three hundred eighteen billion, one hundred fifty-five million, one hundred seventy-one thousand, eight hundred forty".