61347686129 has 4 divisors (see below), whose sum is σ = 61352843376. Its totient is φ = 61342528884.

The previous prime is 61347686111. The next prime is 61347686177. The reversal of 61347686129 is 92168674316.

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-61347686129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61347680129) 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, 2560739 + ... + 2584584.

It is an arithmetic number, because the mean of its divisors is an integer number (15338210844).

Almost surely, 2^61347686129 is an apocalyptic number.

It is an amenable number.

61347686129 is a deficient number, since it is larger than the sum of its proper divisors (5157247).

61347686129 is a wasteful number, since it uses less digits than its factorization.

61347686129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5157246.

The product of its digits is 2612736, while the sum is 53.

The spelling of 61347686129 in words is "sixty-one billion, three hundred forty-seven million, six hundred eighty-six thousand, one hundred twenty-nine".