66615610614 has 64 divisors (see below), whose sum is σ = 156215969280. Its totient is φ = 18544780800.

The previous prime is 66615610577. The next prime is 66615610637. The reversal of 66615610614 is 41601651666.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161064 + ... + 398964.

It is an arithmetic number, because the mean of its divisors is an integer number (2440874520).

Almost surely, 2^66615610614 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66615610614, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78107984640).

66615610614 is an abundant number, since it is smaller than the sum of its proper divisors (89600358666).

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

66615610614 is a wasteful number, since it uses less digits than its factorization.

66615610614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238085.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 66615610614 in words is "sixty-six billion, six hundred fifteen million, six hundred ten thousand, six hundred fourteen".