618664743648 has 384 divisors, whose sum is σ = 2216137190400. Its totient is φ = 163878764544.

The previous prime is 618664743629. The next prime is 618664743689. The reversal of 618664743648 is 846347466816.

It is a happy number.

618664743648 is a `hidden beast` number, since 61 + 8 + 66 + 47 + 436 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 6843768 + ... + 6933576.

It is an arithmetic number, because the mean of its divisors is an integer number (5771190600).

Almost surely, 2^618664743648 is an apocalyptic number.

618664743648 is a gapful number since it is divisible by the number (68) 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 618664743648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1108068595200).

618664743648 is an abundant number, since it is smaller than the sum of its proper divisors (1597472446752).

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

618664743648 is a wasteful number, since it uses less digits than its factorization.

618664743648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89919 (or 89905 counting only the distinct ones).

The product of its digits is 111476736, while the sum is 63.

The spelling of 618664743648 in words is "six hundred eighteen billion, six hundred sixty-four million, seven hundred forty-three thousand, six hundred forty-eight".