1661016568 has 16 divisors (see below), whose sum is σ = 3116310480. Its totient is φ = 830000448.

The previous prime is 1661016551. The next prime is 1661016607. The reversal of 1661016568 is 8656101661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661016568.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49396 + ... + 75907.

It is an arithmetic number, because the mean of its divisors is an integer number (194769405).

Almost surely, 2^1661016568 is an apocalyptic number.

It is an amenable number.

1661016568 is a deficient number, since it is larger than the sum of its proper divisors (1455293912).

1661016568 is a wasteful number, since it uses less digits than its factorization.

1661016568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126966 (or 126962 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 1661016568 is about 40755.5710056920. The cubic root of 1661016568 is about 1184.2897981125.

The spelling of 1661016568 in words is "one billion, six hundred sixty-one million, sixteen thousand, five hundred sixty-eight".