1966494640 has 160 divisors (see below), whose sum is σ = 5197167360. Its totient is φ = 685440000.

The previous prime is 1966494631. The next prime is 1966494653. The reversal of 1966494640 is 464946691.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6405367 + ... + 6405673.

It is an arithmetic number, because the mean of its divisors is an integer number (32482296).

Almost surely, 2^1966494640 is an apocalyptic number.

1966494640 is a gapful number since it is divisible by the number (10) 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 1966494640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2598583680).

1966494640 is an abundant number, since it is smaller than the sum of its proper divisors (3230672720).

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

1966494640 is a wasteful number, since it uses less digits than its factorization.

1966494640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 1966494640 is about 44345.1760623408. The cubic root of 1966494640 is about 1252.8457065140.

The spelling of 1966494640 in words is "one billion, nine hundred sixty-six million, four hundred ninety-four thousand, six hundred forty".