61212360155 has 4 divisors (see below), whose sum is σ = 73454832192. Its totient is φ = 48969888120.

The previous prime is 61212360133. The next prime is 61212360161. The reversal of 61212360155 is 55106321216.

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

It is not a de Polignac number, because 61212360155 - 2³² = 56917392859 is a prime.

It is a Duffinian 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, 6121236011 + ... + 6121236020.

It is an arithmetic number, because the mean of its divisors is an integer number (18363708048).

Almost surely, 2^61212360155 is an apocalyptic number.

61212360155 is a deficient number, since it is larger than the sum of its proper divisors (12242472037).

61212360155 is a wasteful number, since it uses less digits than its factorization.

61212360155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12242472036.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 61212360155 in words is "sixty-one billion, two hundred twelve million, three hundred sixty thousand, one hundred fifty-five".