1643162007 has 4 divisors (see below), whose sum is σ = 2190882680. Its totient is φ = 1095441336.

The previous prime is 1643161963. The next prime is 1643162077. The reversal of 1643162007 is 7002613461.

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

It is not a de Polignac number, because 1643162007 - 2¹⁹ = 1642637719 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 (1643162077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273860332 + ... + 273860337.

It is an arithmetic number, because the mean of its divisors is an integer number (547720670).

Almost surely, 2^1643162007 is an apocalyptic number.

1643162007 is a deficient number, since it is larger than the sum of its proper divisors (547720673).

1643162007 is an equidigital number, since it uses as much as digits as its factorization.

1643162007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547720672.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1643162007 is about 40535.9347616408. The cubic root of 1643162007 is about 1180.0311221802.

Adding to 1643162007 its reverse (7002613461), we get a palindrome (8645775468).

The spelling of 1643162007 in words is "one billion, six hundred forty-three million, one hundred sixty-two thousand, seven".