66520194 has 32 divisors (see below), whose sum is σ = 145986624. Its totient is φ = 20080320.

The previous prime is 66520177. The next prime is 66520211. The reversal of 66520194 is 49102566.

It is an interprime number because it is at equal distance from previous prime (66520177) and next prime (66520211).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3912 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (4562082).

Almost surely, 2^66520194 is an apocalyptic number.

66520194 is an abundant number, since it is smaller than the sum of its proper divisors (79466430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66520194 is a wasteful number, since it uses less digits than its factorization.

66520194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16162.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 66520194 is about 8155.9912947477. The cubic root of 66520194 is about 405.1829565088.

The spelling of 66520194 in words is "sixty-six million, five hundred twenty thousand, one hundred ninety-four".