61686890934658 has 8 divisors (see below), whose sum is σ = 100942185165840. Its totient is φ = 28039495879380.

The previous prime is 61686890934637. The next prime is 61686890934659. The reversal of 61686890934658 is 85643909868616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (61686890934659) 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, 1401974793948 + ... + 1401974793991.

It is an arithmetic number, because the mean of its divisors is an integer number (12617773145730).

Almost surely, 2^{61686890934658} is an apocalyptic number.

61686890934658 is a deficient number, since it is larger than the sum of its proper divisors (39255294231182).

61686890934658 is a wasteful number, since it uses less digits than its factorization.

61686890934658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803949587952.

The product of its (nonzero) digits is 3224862720, while the sum is 79.

The spelling of 61686890934658 in words is "sixty-one trillion, six hundred eighty-six billion, eight hundred ninety million, nine hundred thirty-four thousand, six hundred fifty-eight".