1066621563 has 36 divisors (see below), whose sum is σ = 1886556360. Its totient is φ = 577414656.

The previous prime is 1066621559. The next prime is 1066621637. The reversal of 1066621563 is 3651266601.

It is not a de Polignac number, because 1066621563 - 2² = 1066621559 is a prime.

It is a super-2 number, since 2×1066621563² = 2275363117313125938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066621553) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 55270 + ... + 72027.

Almost surely, 2^1066621563 is an apocalyptic number.

1066621563 is a deficient number, since it is larger than the sum of its proper divisors (819934797).

1066621563 is a wasteful number, since it uses less digits than its factorization.

1066621563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127336 (or 127326 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 1066621563 is about 32659.1727237540. The cubic root of 1066621563 is about 1021.7315082529.

The spelling of 1066621563 in words is "one billion, sixty-six million, six hundred twenty-one thousand, five hundred sixty-three".