72261670666 has 16 divisors (see below), whose sum is σ = 110020042944. Its totient is φ = 35588418624.

The previous prime is 72261670651. The next prime is 72261670709. The reversal of 72261670666 is 66607616227.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2444611 + ... + 2473993.

It is an arithmetic number, because the mean of its divisors is an integer number (6876252684).

Almost surely, 2^72261670666 is an apocalyptic number.

72261670666 is a deficient number, since it is larger than the sum of its proper divisors (37758372278).

72261670666 is a wasteful number, since it uses less digits than its factorization.

72261670666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47805.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 72261670666 in words is "seventy-two billion, two hundred sixty-one million, six hundred seventy thousand, six hundred sixty-six".