561211212606 has 32 divisors (see below), whose sum is σ = 1250513192448. Its totient is φ = 166445619840.

The previous prime is 561211212563. The next prime is 561211212619. The reversal of 561211212606 is 606212112165.

It is a super-2 number, since 2×561211212606² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90456475 + ... + 90462678.

It is an arithmetic number, because the mean of its divisors is an integer number (39078537264).

Almost surely, 2^561211212606 is an apocalyptic number.

561211212606 is an abundant number, since it is smaller than the sum of its proper divisors (689301979842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561211212606 is a wasteful number, since it uses less digits than its factorization.

561211212606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180919216.

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 561211212606 in words is "five hundred sixty-one billion, two hundred eleven million, two hundred twelve thousand, six hundred six".