66161901 has 8 divisors (see below), whose sum is σ = 95001760. Its totient is φ = 40714992.

The previous prime is 66161891. The next prime is 66161923. The reversal of 66161901 is 10916166.

It is a happy number.

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

It is not a de Polignac number, because 66161901 - 2¹¹ = 66159853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66161941) 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, 848191 + ... + 848268.

It is an arithmetic number, because the mean of its divisors is an integer number (11875220).

Almost surely, 2^66161901 is an apocalyptic number.

It is an amenable number.

66161901 is a deficient number, since it is larger than the sum of its proper divisors (28839859).

66161901 is a wasteful number, since it uses less digits than its factorization.

66161901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696475.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 66161901 is about 8133.9966191289. The cubic root of 66161901 is about 404.4541770799.

The spelling of 66161901 in words is "sixty-six million, one hundred sixty-one thousand, nine hundred one".