620664622640640 has 1600 divisors, whose sum is σ = 2348739907024896. Its totient is φ = 156338414419968.

The previous prime is 620664622640609. The next prime is 620664622640659. The reversal of 620664622640640 is 46046226466026.

620664622640640 is a `hidden beast` number, since 6 + 2 + 0 + 6 + 6 + 4 + 6 + 226 + 406 + 4 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 260455148889 + ... + 260455151271.

Almost surely, 2^{620664622640640} is an apocalyptic number.

620664622640640 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 620664622640640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1174369953512448).

620664622640640 is an abundant number, since it is smaller than the sum of its proper divisors (1728075284384256).

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

620664622640640 is a wasteful number, since it uses less digits than its factorization.

620664622640640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101 (or 3076 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 54.

The spelling of 620664622640640 in words is "six hundred twenty trillion, six hundred sixty-four billion, six hundred twenty-two million, six hundred forty thousand, six hundred forty".