618666215040 has 512 divisors, whose sum is σ = 2284747776000. Its totient is φ = 158018273280.

The previous prime is 618666215017. The next prime is 618666215051. The reversal of 618666215040 is 40512666816.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63637380 + ... + 63647100.

It is an arithmetic number, because the mean of its divisors is an integer number (4462398000).

Almost surely, 2^618666215040 is an apocalyptic number.

618666215040 is a gapful number since it is divisible by the number (60) 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 618666215040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1142373888000).

618666215040 is an abundant number, since it is smaller than the sum of its proper divisors (1666081560960).

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

618666215040 is a wasteful number, since it uses less digits than its factorization.

618666215040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9905 (or 9887 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 618666215040 in words is "six hundred eighteen billion, six hundred sixty-six million, two hundred fifteen thousand, forty".