1966261596 has 144 divisors (see below), whose sum is σ = 5226480000. Its totient is φ = 574269696.

The previous prime is 1966261571. The next prime is 1966261601. The reversal of 1966261596 is 6951626691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3940155 + ... + 3940653.

It is an arithmetic number, because the mean of its divisors is an integer number (36295000).

Almost surely, 2^1966261596 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 1966261596, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2613240000).

1966261596 is an abundant number, since it is smaller than the sum of its proper divisors (3260218404).

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

1966261596 is a wasteful number, since it uses less digits than its factorization.

1966261596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 613 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 51.

The square root of 1966261596 is about 44342.5483706113. The cubic root of 1966261596 is about 1252.7962140986.

The spelling of 1966261596 in words is "one billion, nine hundred sixty-six million, two hundred sixty-one thousand, five hundred ninety-six".