66195501 has 32 divisors (see below), whose sum is σ = 96235776. Its totient is φ = 40320000.

The previous prime is 66195499. The next prime is 66195511. The reversal of 66195501 is 10559166.

It is not a de Polignac number, because 66195501 - 2¹ = 66195499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66195511) 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, 365631 + ... + 365811.

It is an arithmetic number, because the mean of its divisors is an integer number (3007368).

Almost surely, 2^66195501 is an apocalyptic number.

It is an amenable number.

66195501 is a deficient number, since it is larger than the sum of its proper divisors (30040275).

66195501 is a wasteful number, since it uses less digits than its factorization.

66195501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 66195501 is about 8136.0617623024. The cubic root of 66195501 is about 404.5226321893.

The spelling of 66195501 in words is "sixty-six million, one hundred ninety-five thousand, five hundred one".