166550601565655 has 8 divisors (see below), whose sum is σ = 206307841939584. Its totient is φ = 128942401212000.

The previous prime is 166550601565591. The next prime is 166550601565723. The reversal of 166550601565655 is 556565106055661.

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

It is not a de Polignac number, because 166550601565655 - 2⁶ = 166550601565591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537260004896 + ... + 537260005205.

It is an arithmetic number, because the mean of its divisors is an integer number (25788480242448).

Almost surely, 2^{166550601565655} is an apocalyptic number.

166550601565655 is a deficient number, since it is larger than the sum of its proper divisors (39757240373929).

166550601565655 is a wasteful number, since it uses less digits than its factorization.

166550601565655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074520010137.

The product of its (nonzero) digits is 121500000, while the sum is 62.

The spelling of 166550601565655 in words is "one hundred sixty-six trillion, five hundred fifty billion, six hundred one million, five hundred sixty-five thousand, six hundred fifty-five".