61061006155 has 4 divisors (see below), whose sum is σ = 73273207392. Its totient is φ = 48848804920.

The previous prime is 61061006099. The next prime is 61061006183. The reversal of 61061006155 is 55160016016.

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

It is a de Polignac number, because none of the positive numbers 2^k-61061006155 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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6106100611 + ... + 6106100620.

It is an arithmetic number, because the mean of its divisors is an integer number (18318301848).

Almost surely, 2^61061006155 is an apocalyptic number.

61061006155 is a deficient number, since it is larger than the sum of its proper divisors (12212201237).

61061006155 is a wasteful number, since it uses less digits than its factorization.

61061006155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12212201236.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 61061006155 in words is "sixty-one billion, sixty-one million, six thousand, one hundred fifty-five".