1218172752140 has 24 divisors (see below), whose sum is σ = 2620556995392. Its totient is φ = 475384488320.

The previous prime is 1218172752131. The next prime is 1218172752179. The reversal of 1218172752140 is 412572718121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742787444 + ... + 742789083.

It is an arithmetic number, because the mean of its divisors is an integer number (109189874808).

Almost surely, 2^{1218172752140} is an apocalyptic number.

1218172752140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218172752140 is an abundant number, since it is smaller than the sum of its proper divisors (1402384243252).

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

1218172752140 is a wasteful number, since it uses less digits than its factorization.

1218172752140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485576577 (or 1485576575 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 41.

The spelling of 1218172752140 in words is "one trillion, two hundred eighteen billion, one hundred seventy-two million, seven hundred fifty-two thousand, one hundred forty".