61188505149 has 16 divisors (see below), whose sum is σ = 81923721408. Its totient is φ = 40623149952.

The previous prime is 61188505139. The next prime is 61188505177. The reversal of 61188505149 is 94150588116.

It is not a de Polignac number, because 61188505149 - 2⁸ = 61188504893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61188505098 and 61188505107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61188505109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 693214 + ... + 776480.

It is an arithmetic number, because the mean of its divisors is an integer number (5120232588).

Almost surely, 2^61188505149 is an apocalyptic number.

It is an amenable number.

61188505149 is a deficient number, since it is larger than the sum of its proper divisors (20735216259).

61188505149 is a wasteful number, since it uses less digits than its factorization.

61188505149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84284.

The product of its (nonzero) digits is 345600, while the sum is 48.

The spelling of 61188505149 in words is "sixty-one billion, one hundred eighty-eight million, five hundred five thousand, one hundred forty-nine".