6620370730640 has 80 divisors (see below), whose sum is σ = 16066942828416. Its totient is φ = 2532168038400.

The previous prime is 6620370730639. The next prime is 6620370730691. The reversal of 6620370730640 is 460370730266.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×6620370730640² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6620370730591 and 6620370730600.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4942760 + ... + 6137720.

Almost surely, 2^{6620370730640} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6620370730640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8033471414208).

6620370730640 is an abundant number, since it is smaller than the sum of its proper divisors (9446572097776).

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

6620370730640 is a wasteful number, since it uses less digits than its factorization.

6620370730640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198008 (or 1198002 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 44.

The spelling of 6620370730640 in words is "six trillion, six hundred twenty billion, three hundred seventy million, seven hundred thirty thousand, six hundred forty".