642159765 has 32 divisors (see below), whose sum is σ = 1229437440. Its totient is φ = 316139328.

The previous prime is 642159719. The next prime is 642159769. The reversal of 642159765 is 567951246.

It is not a de Polignac number, because 642159765 - 2⁸ = 642159509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 642159765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642159769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181197 + ... + 184706.

It is an arithmetic number, because the mean of its divisors is an integer number (38419920).

Almost surely, 2^642159765 is an apocalyptic number.

642159765 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

642159765 is a deficient number, since it is larger than the sum of its proper divisors (587277675).

642159765 is a wasteful number, since it uses less digits than its factorization.

642159765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365930 (or 365924 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 642159765 is about 25340.8714333189. The cubic root of 642159765 is about 862.7421777403.

The spelling of 642159765 in words is "six hundred forty-two million, one hundred fifty-nine thousand, seven hundred sixty-five".