65618881656 has 32 divisors (see below), whose sum is σ = 168480914640. Its totient is φ = 21281799168.

The previous prime is 65618881651. The next prime is 65618881661.

65618881656 is nontrivially palindromic in base 10.

65618881656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (65618881651) and next prime (65618881661).

It is a self number, because there is not a number n which added to its sum of digits gives 65618881656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65618881651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36946681 + ... + 36948456.

Almost surely, 2^65618881656 is an apocalyptic number.

It is an amenable number.

65618881656 is an abundant number, since it is smaller than the sum of its proper divisors (102862032984).

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

65618881656 is a wasteful number, since it uses less digits than its factorization.

65618881656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73895183 (or 73895179 counting only the distinct ones).

The product of its digits is 16588800, while the sum is 60.

The spelling of 65618881656 in words is "sixty-five billion, six hundred eighteen million, eight hundred eighty-one thousand, six hundred fifty-six".