1641947065 has 48 divisors (see below), whose sum is σ = 2235662208. Its totient is φ = 1147776000.

The previous prime is 1641947063. The next prime is 1641947077. The reversal of 1641947065 is 5607491461.

It is not a de Polignac number, because 1641947065 - 2¹ = 1641947063 is a prime.

It is a super-2 number, since 2×1641947065² = 5391980328524228450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641947063) 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 47 ways as a sum of consecutive naturals, for example, 14530449 + ... + 14530561.

It is an arithmetic number, because the mean of its divisors is an integer number (46576296).

Almost surely, 2^1641947065 is an apocalyptic number.

It is an amenable number.

1641947065 is a deficient number, since it is larger than the sum of its proper divisors (593715143).

1641947065 is a wasteful number, since it uses less digits than its factorization.

1641947065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1641947065 is about 40520.9460032710. The cubic root of 1641947065 is about 1179.7402150027.

The spelling of 1641947065 in words is "one billion, six hundred forty-one million, nine hundred forty-seven thousand, sixty-five".