61212185455 has 4 divisors (see below), whose sum is σ = 73454622552. Its totient is φ = 48969748360.

The previous prime is 61212185443. The next prime is 61212185483. The reversal of 61212185455 is 55458121216.

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

It is not a de Polignac number, because 61212185455 - 2⁷ = 61212185327 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 6121218541 + ... + 6121218550.

It is an arithmetic number, because the mean of its divisors is an integer number (18363655638).

Almost surely, 2^61212185455 is an apocalyptic number.

61212185455 is a deficient number, since it is larger than the sum of its proper divisors (12242437097).

61212185455 is a wasteful number, since it uses less digits than its factorization.

61212185455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12242437096.

The product of its digits is 96000, while the sum is 40.

The spelling of 61212185455 in words is "sixty-one billion, two hundred twelve million, one hundred eighty-five thousand, four hundred fifty-five".