61211215206 has 48 divisors (see below), whose sum is σ = 141091402608. Its totient is φ = 19112486400.

The previous prime is 61211215187. The next prime is 61211215237. The reversal of 61211215206 is 60251211216.

61211215206 is a `hidden beast` number, since 6 + 12 + 1 + 121 + 520 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 61211215206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 409455 + ... + 538586.

It is an arithmetic number, because the mean of its divisors is an integer number (2939404221).

Almost surely, 2^61211215206 is an apocalyptic number.

61211215206 is an abundant number, since it is smaller than the sum of its proper divisors (79880187402).

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

61211215206 is a wasteful number, since it uses less digits than its factorization.

61211215206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948277 (or 948274 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 61211215206 in words is "sixty-one billion, two hundred eleven million, two hundred fifteen thousand, two hundred six".