1518278345640 has 512 divisors, whose sum is σ = 6249156480000. Its totient is φ = 326619869184.

The previous prime is 1518278345593. The next prime is 1518278345653. The reversal of 1518278345640 is 465438728151.

It is a happy number.

1518278345640 is a `hidden beast` number, since 1 + 5 + 1 + 8 + 2 + 78 + 3 + 4 + 564 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6176934 + ... + 6418026.

It is an arithmetic number, because the mean of its divisors is an integer number (12205383750).

Almost surely, 2^{1518278345640} is an apocalyptic number.

1518278345640 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 1518278345640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3124578240000).

1518278345640 is an abundant number, since it is smaller than the sum of its proper divisors (4730878134360).

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

1518278345640 is a wasteful number, since it uses less digits than its factorization.

1518278345640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241151 (or 241127 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 1518278345640 in words is "one trillion, five hundred eighteen billion, two hundred seventy-eight million, three hundred forty-five thousand, six hundred forty".