1061666389 has 12 divisors (see below), whose sum is σ = 1253436384. Its totient is φ = 896414904.

The previous prime is 1061666377. The next prime is 1061666461. The reversal of 1061666389 is 9836661601.

It is not a de Polignac number, because 1061666389 - 2⁵ = 1061666357 is a prime.

It is a super-2 number, since 2×1061666389² = 2254271043064598642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061666329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158409 + ... + 164974.

It is an arithmetic number, because the mean of its divisors is an integer number (104453032).

Almost surely, 2^1061666389 is an apocalyptic number.

It is an amenable number.

1061666389 is a deficient number, since it is larger than the sum of its proper divisors (191769995).

1061666389 is an equidigital number, since it uses as much as digits as its factorization.

1061666389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323464 (or 323457 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1061666389 is about 32583.2225079104. Note that the first 3 decimals coincide. The cubic root of 1061666389 is about 1020.1468419247.

The spelling of 1061666389 in words is "one billion, sixty-one million, six hundred sixty-six thousand, three hundred eighty-nine".