1641534645 has 8 divisors (see below), whose sum is σ = 2626455456. Its totient is φ = 875485136.

The previous prime is 1641534523. The next prime is 1641534667. The reversal of 1641534645 is 5464351461.

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 1641534645 - 2⁹ = 1641534133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54717807 + ... + 54717836.

It is an arithmetic number, because the mean of its divisors is an integer number (328306932).

Almost surely, 2^1641534645 is an apocalyptic number.

1641534645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1641534645 is a deficient number, since it is larger than the sum of its proper divisors (984920811).

1641534645 is a wasteful number, since it uses less digits than its factorization.

1641534645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109435651.

The product of its digits is 172800, while the sum is 39.

The square root of 1641534645 is about 40515.8567106756. The cubic root of 1641534645 is about 1179.6414320370.

The spelling of 1641534645 in words is "one billion, six hundred forty-one million, five hundred thirty-four thousand, six hundred forty-five".