61398132647 has 4 divisors (see below), whose sum is σ = 61424702736. Its totient is φ = 61371562560.

The previous prime is 61398132619. The next prime is 61398132659. The reversal of 61398132647 is 74623189316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61398132647 - 2¹⁸ = 61397870503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61398132595 and 61398132604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61398132617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13281578 + ... + 13286199.

It is an arithmetic number, because the mean of its divisors is an integer number (15356175684).

Almost surely, 2^61398132647 is an apocalyptic number.

61398132647 is a deficient number, since it is larger than the sum of its proper divisors (26570089).

61398132647 is a wasteful number, since it uses less digits than its factorization.

61398132647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26570088.

The product of its digits is 1306368, while the sum is 50.

The spelling of 61398132647 in words is "sixty-one billion, three hundred ninety-eight million, one hundred thirty-two thousand, six hundred forty-seven".