1641052661 has 4 divisors (see below), whose sum is σ = 1656108300. Its totient is φ = 1625997024.

The previous prime is 1641052643. The next prime is 1641052663. The reversal of 1641052661 is 1662501461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1321322500 + 319730161 = 36350^2 + 17881^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641052661 - 2⁶ = 1641052597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641052663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7527656 + ... + 7527873.

It is an arithmetic number, because the mean of its divisors is an integer number (414027075).

Almost surely, 2^1641052661 is an apocalyptic number.

It is an amenable number.

1641052661 is a deficient number, since it is larger than the sum of its proper divisors (15055639).

1641052661 is a wasteful number, since it uses less digits than its factorization.

1641052661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15055638.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1641052661 is about 40509.9081830606. The cubic root of 1641052661 is about 1179.5259661112.

The spelling of 1641052661 in words is "one billion, six hundred forty-one million, fifty-two thousand, six hundred sixty-one".