165015011556661 has 8 divisors (see below), whose sum is σ = 188600527551744. Its totient is φ = 141432481290480.

The previous prime is 165015011556649. The next prime is 165015011556709. The reversal of 165015011556661 is 166655110510561.

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

It is a cyclic number.

It is not a de Polignac number, because 165015011556661 - 2³⁵ = 164980651818293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165015011956661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 746313790 + ... + 746534863.

It is an arithmetic number, because the mean of its divisors is an integer number (23575065943968).

Almost surely, 2^{165015011556661} is an apocalyptic number.

It is an amenable number.

165015011556661 is a deficient number, since it is larger than the sum of its proper divisors (23585515995083).

165015011556661 is a wasteful number, since it uses less digits than its factorization.

165015011556661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492864451.

The product of its (nonzero) digits is 810000, while the sum is 49.

The spelling of 165015011556661 in words is "one hundred sixty-five trillion, fifteen billion, eleven million, five hundred fifty-six thousand, six hundred sixty-one".