66906169 has 8 divisors (see below), whose sum is σ = 77282208. Its totient is φ = 57245760.

The previous prime is 66906167. The next prime is 66906173. The reversal of 66906169 is 96160966.

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

It is not a de Polignac number, because 66906169 - 2¹ = 66906167 is a prime.

It is a super-2 number, since 2×66906169² = 8952870900513122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66906167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178707 + ... + 179080.

It is an arithmetic number, because the mean of its divisors is an integer number (9660276).

Almost surely, 2^66906169 is an apocalyptic number.

It is an amenable number.

66906169 is a deficient number, since it is larger than the sum of its proper divisors (10376039).

66906169 is a wasteful number, since it uses less digits than its factorization.

66906169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357815.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 66906169 is about 8179.6191231622. The cubic root of 66906169 is about 405.9651199135.

The spelling of 66906169 in words is "sixty-six million, nine hundred six thousand, one hundred sixty-nine".