1061664643 has 8 divisors (see below), whose sum is σ = 1174232528. Its totient is φ = 953511264.

The previous prime is 1061664607. The next prime is 1061664661. The reversal of 1061664643 is 3464661601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1061664643 - 2²⁵ = 1028110211 is a prime.

It is a super-2 number, since 2×1061664643² = 2254263628392634898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1061664143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1103121 + ... + 1104082.

It is an arithmetic number, because the mean of its divisors is an integer number (146779066).

Almost surely, 2^1061664643 is an apocalyptic number.

1061664643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1061664643 is a deficient number, since it is larger than the sum of its proper divisors (112567885).

1061664643 is a wasteful number, since it uses less digits than its factorization.

1061664643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207253.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 1061664643 is about 32583.1957149694. The cubic root of 1061664643 is about 1020.1462826852.

The spelling of 1061664643 in words is "one billion, sixty-one million, six hundred sixty-four thousand, six hundred forty-three".