1055666520 has 160 divisors (see below), whose sum is σ = 3585859200. Its totient is φ = 278525952.

The previous prime is 1055666503. The next prime is 1055666531. The reversal of 1055666520 is 256665501.

It is a happy number.

It is a super-2 number, since 2×1055666520² = 2228863602897820800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 312601 + ... + 315959.

It is an arithmetic number, because the mean of its divisors is an integer number (22411620).

Almost surely, 2^1055666520 is an apocalyptic number.

1055666520 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 1055666520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1792929600).

1055666520 is an abundant number, since it is smaller than the sum of its proper divisors (2530192680).

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

1055666520 is a wasteful number, since it uses less digits than its factorization.

1055666520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3479 (or 3466 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 1055666520 is about 32491.0221445863. The cubic root of 1055666520 is about 1018.2214681239.

The spelling of 1055666520 in words is "one billion, fifty-five million, six hundred sixty-six thousand, five hundred twenty".