66726905 has 16 divisors (see below), whose sum is σ = 91818624. Its totient is φ = 45601920.

The previous prime is 66726901. The next prime is 66726931. The reversal of 66726905 is 50962766.

It is not a de Polignac number, because 66726905 - 2² = 66726901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66726901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7910 + ... + 14000.

It is an arithmetic number, because the mean of its divisors is an integer number (5738664).

Almost surely, 2^66726905 is an apocalyptic number.

It is an amenable number.

66726905 is a deficient number, since it is larger than the sum of its proper divisors (25091719).

66726905 is a wasteful number, since it uses less digits than its factorization.

66726905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6416.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 66726905 is about 8168.6538058605. The cubic root of 66726905 is about 405.6022235100.

It can be divided in two parts, 667 and 26905, that added together give a palindrome (27572).

The spelling of 66726905 in words is "sixty-six million, seven hundred twenty-six thousand, nine hundred five".