61686886291181 has 4 divisors (see below), whose sum is σ = 61693893784512. Its totient is φ = 61679878797852.

The previous prime is 61686886291141. The next prime is 61686886291213. The reversal of 61686886291181 is 18119268868616.

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 not a de Polignac number, because 61686886291181 - 2⁶ = 61686886291117 is a prime.

It is a super-2 number, since 2×61686886291181² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61686886291141) 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, 3503733461 + ... + 3503751066.

It is an arithmetic number, because the mean of its divisors is an integer number (15423473446128).

Almost surely, 2^{61686886291181} is an apocalyptic number.

It is an amenable number.

61686886291181 is a deficient number, since it is larger than the sum of its proper divisors (7007493331).

61686886291181 is an equidigital number, since it uses as much as digits as its factorization.

61686886291181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007493330.

The product of its digits is 95551488, while the sum is 71.

The spelling of 61686886291181 in words is "sixty-one trillion, six hundred eighty-six billion, eight hundred eighty-six million, two hundred ninety-one thousand, one hundred eighty-one".