166535432601 has 4 divisors (see below), whose sum is σ = 222047243472. Its totient is φ = 111023621732.

The previous prime is 166535432597. The next prime is 166535432639. The reversal of 166535432601 is 106234535661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166535432601 - 2² = 166535432597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166535432671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27755905431 + ... + 27755905436.

It is an arithmetic number, because the mean of its divisors is an integer number (55511810868).

Almost surely, 2^166535432601 is an apocalyptic number.

It is an amenable number.

166535432601 is a deficient number, since it is larger than the sum of its proper divisors (55511810871).

166535432601 is an equidigital number, since it uses as much as digits as its factorization.

166535432601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55511810870.

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 166535432601 in words is "one hundred sixty-six billion, five hundred thirty-five million, four hundred thirty-two thousand, six hundred one".