66949901 has 8 divisors (see below), whose sum is σ = 71099520. Its totient is φ = 62862912.

The previous prime is 66949877. The next prime is 66949919. The reversal of 66949901 is 10994966.

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

It is a cyclic number.

It is not a de Polignac number, because 66949901 - 2¹⁰ = 66948877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66949921) 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, 13445 + ... + 17738.

It is an arithmetic number, because the mean of its divisors is an integer number (8887440).

Almost surely, 2^66949901 is an apocalyptic number.

It is an amenable number.

66949901 is a deficient number, since it is larger than the sum of its proper divisors (4149619).

66949901 is a wasteful number, since it uses less digits than its factorization.

66949901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31315.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 66949901 is about 8182.2919160832. The cubic root of 66949901 is about 406.0535512205.

The spelling of 66949901 in words is "sixty-six million, nine hundred forty-nine thousand, nine hundred one".