1066601540 has 72 divisors (see below), whose sum is σ = 2375276568. Its totient is φ = 402209280.

The previous prime is 1066601507. The next prime is 1066601551. The reversal of 1066601540 is 451066601.

It can be written as a sum of positive squares in 4 ways, for example, as 113891584 + 952709956 = 10672^2 + 30866^2 .

It is a super-2 number, since 2×1066601540² = 2275277690260743200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 771650 + ... + 773030.

Almost surely, 2^1066601540 is an apocalyptic number.

1066601540 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 1066601540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1187638284).

1066601540 is an abundant number, since it is smaller than the sum of its proper divisors (1308675028).

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

1066601540 is a wasteful number, since it uses less digits than its factorization.

1066601540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509 (or 1484 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1066601540 is about 32658.8661775022. The cubic root of 1066601540 is about 1021.7251147769.

The spelling of 1066601540 in words is "one billion, sixty-six million, six hundred one thousand, five hundred forty".