66345206511646 has 16 divisors (see below), whose sum is σ = 100402268708304. Its totient is φ = 32877805657984.

The previous prime is 66345206511629. The next prime is 66345206511653. The reversal of 66345206511646 is 64611560254366.

It is a congruent number.

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, 533745 + ... + 11531491.

It is an arithmetic number, because the mean of its divisors is an integer number (6275141794269).

Almost surely, 2^{66345206511646} is an apocalyptic number.

66345206511646 is a deficient number, since it is larger than the sum of its proper divisors (34057062196658).

66345206511646 is a wasteful number, since it uses less digits than its factorization.

66345206511646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11024555.

The product of its (nonzero) digits is 18662400, while the sum is 55.

The spelling of 66345206511646 in words is "sixty-six trillion, three hundred forty-five billion, two hundred six million, five hundred eleven thousand, six hundred forty-six".