18656351616 has 128 divisors (see below), whose sum is σ = 59966991360. Its totient is φ = 5016821760.

The previous prime is 18656351561. The next prime is 18656351621. The reversal of 18656351616 is 61615365681.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×18656351616² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 158440 + ... + 249831.

It is an arithmetic number, because the mean of its divisors is an integer number (468492120).

Almost surely, 2^18656351616 is an apocalyptic number.

18656351616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18656351616 is an abundant number, since it is smaller than the sum of its proper divisors (41310639744).

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

18656351616 is a wasteful number, since it uses less digits than its factorization.

18656351616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408312 (or 408300 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The spelling of 18656351616 in words is "eighteen billion, six hundred fifty-six million, three hundred fifty-one thousand, six hundred sixteen".