1055721366 has 72 divisors (see below), whose sum is σ = 2686913424. Its totient is φ = 298680480.

The previous prime is 1055721349. The next prime is 1055721431. The reversal of 1055721366 is 6631275501.

1055721366 is a `hidden beast` number, since 10 + 5 + 572 + 13 + 66 = 666.

It is a super-2 number, since 2×1055721366² = 2229095205257811912, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1055721366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 85036 + ... + 96656.

It is an arithmetic number, because the mean of its divisors is an integer number (37318242).

Almost surely, 2^1055721366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1055721366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1343456712).

1055721366 is an abundant number, since it is smaller than the sum of its proper divisors (1631192058).

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

1055721366 is a wasteful number, since it uses less digits than its factorization.

1055721366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11746 (or 11736 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 1055721366 is about 32491.8661513924. The cubic root of 1055721366 is about 1018.2391013463.

Adding to 1055721366 its reverse (6631275501), we get a palindrome (7686996867).

The spelling of 1055721366 in words is "one billion, fifty-five million, seven hundred twenty-one thousand, three hundred sixty-six".