66539669955 has 64 divisors (see below), whose sum is σ = 119275504128. Its totient is φ = 31396700160.

The previous prime is 66539669953. The next prime is 66539669957. The reversal of 66539669955 is 55996693566.

It is an interprime number because it is at equal distance from previous prime (66539669953) and next prime (66539669957).

It is not a de Polignac number, because 66539669955 - 2¹ = 66539669953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66539669955.

It is not an unprimeable number, because it can be changed into a prime (66539669953) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1948387 + ... + 1982243.

It is an arithmetic number, because the mean of its divisors is an integer number (1863679752).

Almost surely, 2^66539669955 is an apocalyptic number.

66539669955 is a deficient number, since it is larger than the sum of its proper divisors (52735834173).

66539669955 is a wasteful number, since it uses less digits than its factorization.

66539669955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34196.

The product of its digits is 354294000, while the sum is 69.

The spelling of 66539669955 in words is "sixty-six billion, five hundred thirty-nine million, six hundred sixty-nine thousand, nine hundred fifty-five".