66975901 has 4 divisors (see below), whose sum is σ = 67601952. Its totient is φ = 66349852.

The previous prime is 66975871. The next prime is 66975907. The reversal of 66975901 is 10957966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66975901 - 2¹⁹ = 66451613 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 (66975907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312865 + ... + 313078.

It is an arithmetic number, because the mean of its divisors is an integer number (16900488).

Almost surely, 2^66975901 is an apocalyptic number.

It is an amenable number.

66975901 is a deficient number, since it is larger than the sum of its proper divisors (626051).

66975901 is a wasteful number, since it uses less digits than its factorization.

66975901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626050.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 66975901 is about 8183.8805587570. The cubic root of 66975901 is about 406.1061080618.

It can be divided in two parts, 66975 and 901, that added together give a palindrome (67876).

The spelling of 66975901 in words is "sixty-six million, nine hundred seventy-five thousand, nine hundred one".