642601155 has 64 divisors (see below), whose sum is σ = 1220935680. Its totient is φ = 282509184.

The previous prime is 642601153. The next prime is 642601171. The reversal of 642601155 is 551106246.

It is not a de Polignac number, because 642601155 - 2¹ = 642601153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642601153) 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 63 ways as a sum of consecutive naturals, for example, 290062 + ... + 292268.

It is an arithmetic number, because the mean of its divisors is an integer number (19077120).

Almost surely, 2^642601155 is an apocalyptic number.

642601155 is a deficient number, since it is larger than the sum of its proper divisors (578334525).

642601155 is a wasteful number, since it uses less digits than its factorization.

642601155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 642601155 is about 25349.5789905868. The cubic root of 642601155 is about 862.9398017453.

The spelling of 642601155 in words is "six hundred forty-two million, six hundred one thousand, one hundred fifty-five".