61506715349 has 16 divisors (see below), whose sum is σ = 64249179456. Its totient is φ = 58829846400.

The previous prime is 61506715301. The next prime is 61506715363. The reversal of 61506715349 is 94351760516.

It is a cyclic number.

It is not a de Polignac number, because 61506715349 - 2²⁰ = 61505666773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61506718349) 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, 727754 + ... + 807860.

It is an arithmetic number, because the mean of its divisors is an integer number (4015573716).

Almost surely, 2^61506715349 is an apocalyptic number.

It is an amenable number.

61506715349 is a deficient number, since it is larger than the sum of its proper divisors (2742464107).

61506715349 is a wasteful number, since it uses less digits than its factorization.

61506715349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80516.

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 61506715349 in words is "sixty-one billion, five hundred six million, seven hundred fifteen thousand, three hundred forty-nine".