642261105 has 48 divisors (see below), whose sum is σ = 1207546704. Its totient is φ = 314511360.

The previous prime is 642261097. The next prime is 642261119. The reversal of 642261105 is 501162246.

642261105 is a `hidden beast` number, since 6 + 42 + 2 + 611 + 0 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1766241 + 640494864 = 1329^2 + 25308^2 .

It is not a de Polignac number, because 642261105 - 2³ = 642261097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21127 + ... + 41603.

It is an arithmetic number, because the mean of its divisors is an integer number (25157223).

Almost surely, 2^642261105 is an apocalyptic number.

It is an amenable number.

642261105 is a deficient number, since it is larger than the sum of its proper divisors (565285599).

642261105 is a wasteful number, since it uses less digits than its factorization.

642261105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20546 (or 20543 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 642261105 is about 25342.8708910415. The cubic root of 642261105 is about 862.7875588112.

The spelling of 642261105 in words is "six hundred forty-two million, two hundred sixty-one thousand, one hundred five".