642206145 has 64 divisors (see below), whose sum is σ = 1194024960. Its totient is φ = 288707328.

The previous prime is 642206129. The next prime is 642206153. The reversal of 642206145 is 541602246.

It is not a de Polignac number, because 642206145 - 2⁴ = 642206129 is a prime.

It is a super-2 number, since 2×642206145² = 824857465351522050, which contains 22 as substring.

It is an unprimeable number.

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, 2686936 + ... + 2687174.

It is an arithmetic number, because the mean of its divisors is an integer number (18656640).

Almost surely, 2^642206145 is an apocalyptic number.

It is an amenable number.

642206145 is a deficient number, since it is larger than the sum of its proper divisors (551818815).

642206145 is a wasteful number, since it uses less digits than its factorization.

642206145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 642206145 is about 25341.7865392320. The cubic root of 642206145 is about 862.7629477631.

The spelling of 642206145 in words is "six hundred forty-two million, two hundred six thousand, one hundred forty-five".