20616655661602 has 32 divisors (see below), whose sum is σ = 41521656161664. Its totient is φ = 7414581456000.

The previous prime is 20616655661579. The next prime is 20616655661617.

20616655661602 is nontrivially palindromic in base 10.

It is a super-4 number, since 4×20616655661602⁴ (a number of 54 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20616655661602.

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 15 ways as a sum of consecutive naturals, for example, 5149012899 + ... + 5149016902.

It is an arithmetic number, because the mean of its divisors is an integer number (1297551755052).

Almost surely, 2^{20616655661602} is an apocalyptic number.

20616655661602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20616655661602 is an abundant number, since it is smaller than the sum of its proper divisors (20905000500062).

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

20616655661602 is a wasteful number, since it uses less digits than its factorization.

20616655661602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10298029834.

The product of its (nonzero) digits is 4665600, while the sum is 52.

The spelling of 20616655661602 in words is "twenty trillion, six hundred sixteen billion, six hundred fifty-five million, six hundred sixty-one thousand, six hundred two".