618608121440 has 48 divisors (see below), whose sum is σ = 1525003508448. Its totient is φ = 236684845056.

The previous prime is 618608121437. The next prime is 618608121449. The reversal of 618608121440 is 44121806816.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618608121449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84046337 + ... + 84053696.

It is an arithmetic number, because the mean of its divisors is an integer number (31770906426).

Almost surely, 2^618608121440 is an apocalyptic number.

It is an amenable number.

618608121440 is an abundant number, since it is smaller than the sum of its proper divisors (906395387008).

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

618608121440 is a wasteful number, since it uses less digits than its factorization.

618608121440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168100071 (or 168100063 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The spelling of 618608121440 in words is "six hundred eighteen billion, six hundred eight million, one hundred twenty-one thousand, four hundred forty".