65161005661666 has 8 divisors (see below), whose sum is σ = 99398144229840. Its totient is φ = 32028290918388.

The previous prime is 65161005661601. The next prime is 65161005661673. The reversal of 65161005661666 is 66616650016156.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276105956076 + ... + 276105956311.

It is an arithmetic number, because the mean of its divisors is an integer number (12424768028730).

Almost surely, 2^{65161005661666} is an apocalyptic number.

65161005661666 is a deficient number, since it is larger than the sum of its proper divisors (34237138568174).

65161005661666 is a wasteful number, since it uses less digits than its factorization.

65161005661666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552211912448.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 65161005661666 in words is "sixty-five trillion, one hundred sixty-one billion, five million, six hundred sixty-one thousand, six hundred sixty-six".