645542132222 has 16 divisors (see below), whose sum is σ = 1042843274592. Its totient is φ = 297929823840.

The previous prime is 645542132171. The next prime is 645542132231. The reversal of 645542132222 is 222231245546.

It is a super-2 number, since 2×645542132222² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107072 + ... + 1141292.

It is an arithmetic number, because the mean of its divisors is an integer number (65177704662).

Almost surely, 2^645542132222 is an apocalyptic number.

645542132222 is a deficient number, since it is larger than the sum of its proper divisors (397301142370).

645542132222 is a wasteful number, since it uses less digits than its factorization.

645542132222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058243.

The product of its digits is 230400, while the sum is 38.

Adding to 645542132222 its reverse (222231245546), we get a palindrome (867773377768).

The spelling of 645542132222 in words is "six hundred forty-five billion, five hundred forty-two million, one hundred thirty-two thousand, two hundred twenty-two".