66343645553655 has 16 divisors (see below), whose sum is σ = 109574021044224. Its totient is φ = 34241881575840.

The previous prime is 66343645553599. The next prime is 66343645553693. The reversal of 66343645553655 is 55635554634366.

It is not a de Polignac number, because 66343645553655 - 2³⁸ = 66068767646711 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71337252819 + ... + 71337253748.

It is an arithmetic number, because the mean of its divisors is an integer number (6848376315264).

Almost surely, 2^{66343645553655} is an apocalyptic number.

66343645553655 is a deficient number, since it is larger than the sum of its proper divisors (43230375490569).

66343645553655 is a wasteful number, since it uses less digits than its factorization.

66343645553655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142674506606.

The product of its digits is 1749600000, while the sum is 66.

The spelling of 66343645553655 in words is "sixty-six trillion, three hundred forty-three billion, six hundred forty-five million, five hundred fifty-three thousand, six hundred fifty-five".