2191708945608 has 768 divisors, whose sum is σ = 7545581568000. Its totient is φ = 523452948480.

The previous prime is 2191708945589. The next prime is 2191708945637. The reversal of 2191708945608 is 8065498071912.

It is a super-2 number, since 2×2191708945608² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1603297741 + ... + 1603299107.

It is an arithmetic number, because the mean of its divisors is an integer number (9824976000).

Almost surely, 2^{2191708945608} is an apocalyptic number.

2191708945608 is a gapful number since it is divisible by the number (28) 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 2191708945608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3772790784000).

2191708945608 is an abundant number, since it is smaller than the sum of its proper divisors (5353872622392).

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

2191708945608 is a wasteful number, since it uses less digits than its factorization.

2191708945608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650 (or 1639 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 60.

The spelling of 2191708945608 in words is "two trillion, one hundred ninety-one billion, seven hundred eight million, nine hundred forty-five thousand, six hundred eight".