66291001 has 8 divisors (see below), whose sum is σ = 75939584. Its totient is φ = 56687040.

The previous prime is 66290999. The next prime is 66291023. The reversal of 66291001 is 10019266.

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

It is a 11-Lehmer number, since φ(66291001) divides (66291001-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 66291001 - 2¹ = 66290999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66291601) 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, 7905 + ... + 13966.

It is an arithmetic number, because the mean of its divisors is an integer number (9492448).

Almost surely, 2^66291001 is an apocalyptic number.

It is an amenable number.

66291001 is a deficient number, since it is larger than the sum of its proper divisors (9648583).

66291001 is a wasteful number, since it uses less digits than its factorization.

66291001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22311.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 66291001 is about 8141.9285798882. The cubic root of 66291001 is about 404.7170731389.

The spelling of 66291001 in words is "sixty-six million, two hundred ninety-one thousand, one".