166220535 has 32 divisors (see below), whose sum is σ = 287421120. Its totient is φ = 81543168.

The previous prime is 166220533. The next prime is 166220573. The reversal of 166220535 is 535022661.

It is not a de Polignac number, because 166220535 - 2¹ = 166220533 is a prime.

It is a super-3 number, since 3×166220535³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166220533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60471 + ... + 63159.

It is an arithmetic number, because the mean of its divisors is an integer number (8981910).

Almost surely, 2^166220535 is an apocalyptic number.

166220535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166220535 is a deficient number, since it is larger than the sum of its proper divisors (121200585).

166220535 is a wasteful number, since it uses less digits than its factorization.

166220535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 166220535 is about 12892.6543039050. The cubic root of 166220535 is about 549.8297379315.

The spelling of 166220535 in words is "one hundred sixty-six million, two hundred twenty thousand, five hundred thirty-five".