66345020103550 has 48 divisors (see below), whose sum is σ = 125246103414912. Its totient is φ = 26141386312800.

The previous prime is 66345020103521. The next prime is 66345020103553. The reversal of 66345020103550 is 5530102054366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66345020103553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191684949 + ... + 192030751.

It is an arithmetic number, because the mean of its divisors is an integer number (2609293821144).

Almost surely, 2^{66345020103550} is an apocalyptic number.

66345020103550 is a deficient number, since it is larger than the sum of its proper divisors (58901083311362).

66345020103550 is a wasteful number, since it uses less digits than its factorization.

66345020103550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403153 (or 403148 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 40.

The spelling of 66345020103550 in words is "sixty-six trillion, three hundred forty-five billion, twenty million, one hundred three thousand, five hundred fifty".