1641632555 has 4 divisors (see below), whose sum is σ = 1969959072. Its totient is φ = 1313306040.

The previous prime is 1641632537. The next prime is 1641632569. The reversal of 1641632555 is 5552361461.

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

It is not a de Polignac number, because 1641632555 - 2¹⁰ = 1641631531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164163251 + ... + 164163260.

It is an arithmetic number, because the mean of its divisors is an integer number (492489768).

Almost surely, 2^1641632555 is an apocalyptic number.

1641632555 is a deficient number, since it is larger than the sum of its proper divisors (328326517).

1641632555 is an equidigital number, since it uses as much as digits as its factorization.

1641632555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328326516.

The product of its digits is 108000, while the sum is 38.

The square root of 1641632555 is about 40517.0649850159. The cubic root of 1641632555 is about 1179.6648849680.

The spelling of 1641632555 in words is "one billion, six hundred forty-one million, six hundred thirty-two thousand, five hundred fifty-five".