1642733641 has 2 divisors, whose sum is σ = 1642733642. Its totient is φ = 1642733640.

The previous prime is 1642733629. The next prime is 1642733683. The reversal of 1642733641 is 1463372461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1623767616 + 18966025 = 40296^2 + 4355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642733641 - 2⁹ = 1642733129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1642733641.

It is not a weakly prime, because it can be changed into another prime (1642733941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821366820 + 821366821.

It is an arithmetic number, because the mean of its divisors is an integer number (821366821).

Almost surely, 2^1642733641 is an apocalyptic number.

It is an amenable number.

1642733641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642733641 is an equidigital number, since it uses as much as digits as its factorization.

1642733641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 37.

The square root of 1642733641 is about 40530.6506362777. The cubic root of 1642733641 is about 1179.9285700801.

The spelling of 1642733641 in words is "one billion, six hundred forty-two million, seven hundred thirty-three thousand, six hundred forty-one".