61385744149 has 4 divisors (see below), whose sum is σ = 61497967264. Its totient is φ = 61273521036.

The previous prime is 61385744129. The next prime is 61385744183. The reversal of 61385744149 is 94144758316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61385744149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61385744096 and 61385744105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61385744129) by changing a digit.

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, 56110737 + ... + 56111830.

It is an arithmetic number, because the mean of its divisors is an integer number (15374491816).

Almost surely, 2^61385744149 is an apocalyptic number.

It is an amenable number.

61385744149 is a deficient number, since it is larger than the sum of its proper divisors (112223115).

61385744149 is a wasteful number, since it uses less digits than its factorization.

61385744149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112223114.

The product of its digits is 2903040, while the sum is 52.

The spelling of 61385744149 in words is "sixty-one billion, three hundred eighty-five million, seven hundred forty-four thousand, one hundred forty-nine".