61238678171791 has 4 divisors (see below), whose sum is σ = 61369810245432. Its totient is φ = 61107546098152.

The previous prime is 61238678171743. The next prime is 61238678171837. The reversal of 61238678171791 is 19717187683216.

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 61238678171791 - 2²⁹ = 61238141300879 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 (61238678177791) 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, 65566036120 + ... + 65566037053.

It is an arithmetic number, because the mean of its divisors is an integer number (15342452561358).

Almost surely, 2^{61238678171791} is an apocalyptic number.

61238678171791 is a deficient number, since it is larger than the sum of its proper divisors (131132073641).

61238678171791 is a wasteful number, since it uses less digits than its factorization.

61238678171791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131132073640.

The product of its digits is 42674688, while the sum is 67.

The spelling of 61238678171791 in words is "sixty-one trillion, two hundred thirty-eight billion, six hundred seventy-eight million, one hundred seventy-one thousand, seven hundred ninety-one".