66205533641644 has 6 divisors (see below), whose sum is σ = 115859683872884. Its totient is φ = 33102766820820.

The previous prime is 66205533641633. The next prime is 66205533641669. The reversal of 66205533641644 is 44614633550266.

It is a super-2 number, since 2×66205533641644² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275691705202 + ... + 8275691705209.

Almost surely, 2^{66205533641644} is an apocalyptic number.

It is an amenable number.

66205533641644 is a deficient number, since it is larger than the sum of its proper divisors (49654150231240).

66205533641644 is a wasteful number, since it uses less digits than its factorization.

66205533641644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16551383410415 (or 16551383410413 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 55.

The spelling of 66205533641644 in words is "sixty-six trillion, two hundred five billion, five hundred thirty-three million, six hundred forty-one thousand, six hundred forty-four".