66684380154 has 32 divisors (see below), whose sum is σ = 153770313600. Its totient is φ = 18884070912.

The previous prime is 66684380141. The next prime is 66684380167. The reversal of 66684380154 is 45108348666.

It is an interprime number because it is at equal distance from previous prime (66684380141) and next prime (66684380167).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66684380097 and 66684380106.

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, 7020579 + ... + 7030070.

It is an arithmetic number, because the mean of its divisors is an integer number (4805322300).

Almost surely, 2^66684380154 is an apocalyptic number.

66684380154 is an abundant number, since it is smaller than the sum of its proper divisors (87085933446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66684380154 is a wasteful number, since it uses less digits than its factorization.

66684380154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14050774.

The product of its (nonzero) digits is 3317760, while the sum is 51.

The spelling of 66684380154 in words is "sixty-six billion, six hundred eighty-four million, three hundred eighty thousand, one hundred fifty-four".