61045778245 has 16 divisors (see below), whose sum is σ = 73538919360. Its totient is φ = 48647620224.

The previous prime is 61045778239. The next prime is 61045778257. The reversal of 61045778245 is 54287754016.

It is a cyclic number.

It is not a de Polignac number, because 61045778245 - 2³ = 61045778237 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 1547689 + ... + 1586641.

It is an arithmetic number, because the mean of its divisors is an integer number (4596182460).

Almost surely, 2^61045778245 is an apocalyptic number.

It is an amenable number.

61045778245 is a deficient number, since it is larger than the sum of its proper divisors (12493141115).

61045778245 is a wasteful number, since it uses less digits than its factorization.

61045778245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40164.

The product of its (nonzero) digits is 1881600, while the sum is 49.

The spelling of 61045778245 in words is "sixty-one billion, forty-five million, seven hundred seventy-eight thousand, two hundred forty-five".