661122212005 has 16 divisors (see below), whose sum is σ = 845672659200. Its totient is φ = 494718494400.

The previous prime is 661122211969. The next prime is 661122212027. The reversal of 661122212005 is 500212221166.

It is not a de Polignac number, because 661122212005 - 2¹³ = 661122203813 is a prime.

It is a super-2 number, since 2×661122212005² (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 15 ways as a sum of consecutive naturals, for example, 44037946 + ... + 44052955.

It is an arithmetic number, because the mean of its divisors is an integer number (52854541200).

Almost surely, 2^661122212005 is an apocalyptic number.

It is an amenable number.

661122212005 is a deficient number, since it is larger than the sum of its proper divisors (184550447195).

661122212005 is a wasteful number, since it uses less digits than its factorization.

661122212005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88091004.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 661122212005 in words is "six hundred sixty-one billion, one hundred twenty-two million, two hundred twelve thousand, five".