642165546 has 32 divisors (see below), whose sum is σ = 1402149888. Its totient is φ = 194448240.

The previous prime is 642165541. The next prime is 642165547. The reversal of 642165546 is 645561246.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642165541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110895 + ... + 116541.

It is an arithmetic number, because the mean of its divisors is an integer number (43817184).

Almost surely, 2^642165546 is an apocalyptic number.

642165546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

642165546 is an abundant number, since it is smaller than the sum of its proper divisors (759984342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642165546 is a wasteful number, since it uses less digits than its factorization.

642165546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7386.

The product of its digits is 172800, while the sum is 39.

The square root of 642165546 is about 25340.9854978057. The cubic root of 642165546 is about 862.7447666586.

The spelling of 642165546 in words is "six hundred forty-two million, one hundred sixty-five thousand, five hundred forty-six".