1081966640 has 40 divisors (see below), whose sum is σ = 2519140848. Its totient is φ = 432172800.

The previous prime is 1081966601. The next prime is 1081966661. The reversal of 1081966640 is 466691801.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49415 + ... + 67865.

Almost surely, 2^1081966640 is an apocalyptic number.

1081966640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1081966640 is an abundant number, since it is smaller than the sum of its proper divisors (1437174208).

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

1081966640 is a wasteful number, since it uses less digits than its factorization.

1081966640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19197 (or 19191 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1081966640 is about 32893.2613159595. The cubic root of 1081966640 is about 1026.6079509533.

The spelling of 1081966640 in words is "one billion, eighty-one million, nine hundred sixty-six thousand, six hundred forty".