61121506255 has 4 divisors (see below), whose sum is σ = 73345807512. Its totient is φ = 48897205000.

The previous prime is 61121506219. The next prime is 61121506273. The reversal of 61121506255 is 55260512116.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61121506255 - 2¹¹ = 61121504207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61121506255.

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 3 ways as a sum of consecutive naturals, for example, 6112150621 + ... + 6112150630.

It is an arithmetic number, because the mean of its divisors is an integer number (18336451878).

Almost surely, 2^61121506255 is an apocalyptic number.

61121506255 is a deficient number, since it is larger than the sum of its proper divisors (12224301257).

61121506255 is a wasteful number, since it uses less digits than its factorization.

61121506255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12224301256.

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 61121506255 in words is "sixty-one billion, one hundred twenty-one million, five hundred six thousand, two hundred fifty-five".