66905470 has 32 divisors (see below), whose sum is σ = 122925600. Its totient is φ = 26213760.

The previous prime is 66905467. The next prime is 66905473. The reversal of 66905470 is 7450966.

It is an interprime number because it is at equal distance from previous prime (66905467) and next prime (66905473).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66905473) 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 15 ways as a sum of consecutive naturals, for example, 123400 + ... + 123940.

It is an arithmetic number, because the mean of its divisors is an integer number (3841425).

Almost surely, 2^66905470 is an apocalyptic number.

66905470 is a deficient number, since it is larger than the sum of its proper divisors (56020130).

66905470 is a wasteful number, since it uses less digits than its factorization.

66905470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 66905470 is about 8179.5763948997. The cubic root of 66905470 is about 405.9637061395.

It can be divided in two parts, 669054 and 70, that added together give a square (669124 = 818²).

The spelling of 66905470 in words is "sixty-six million, nine hundred five thousand, four hundred seventy".