61355106139 has 4 divisors (see below), whose sum is σ = 61369977024. Its totient is φ = 61340235256.

The previous prime is 61355106089. The next prime is 61355106157. The reversal of 61355106139 is 93160155316.

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

It is a cyclic number.

It is not a de Polignac number, because 61355106139 - 2¹⁹ = 61354581851 is a prime.

It is a super-3 number, since 3×61355106139³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61355106179) by changing a digit.

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, 7429252 + ... + 7437505.

It is an arithmetic number, because the mean of its divisors is an integer number (15342494256).

Almost surely, 2^61355106139 is an apocalyptic number.

61355106139 is a deficient number, since it is larger than the sum of its proper divisors (14870885).

61355106139 is a wasteful number, since it uses less digits than its factorization.

61355106139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14870884.

The product of its (nonzero) digits is 72900, while the sum is 40.

The spelling of 61355106139 in words is "sixty-one billion, three hundred fifty-five million, one hundred six thousand, one hundred thirty-nine".