166653535013566 has 4 divisors (see below), whose sum is σ = 249980302520352. Its totient is φ = 83326767506782.

The previous prime is 166653535013543. The next prime is 166653535013573. The reversal of 166653535013566 is 665310535356661.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41663383753390 + ... + 41663383753393.

It is an arithmetic number, because the mean of its divisors is an integer number (62495075630088).

Almost surely, 2^{166653535013566} is an apocalyptic number.

166653535013566 is a deficient number, since it is larger than the sum of its proper divisors (83326767506786).

166653535013566 is an equidigital number, since it uses as much as digits as its factorization.

166653535013566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83326767506785.

The product of its (nonzero) digits is 131220000, while the sum is 61.

The spelling of 166653535013566 in words is "one hundred sixty-six trillion, six hundred fifty-three billion, five hundred thirty-five million, thirteen thousand, five hundred sixty-six".