20616543513 has 6 divisors (see below), whose sum is σ = 29779451754. Its totient is φ = 13744362336.

The previous prime is 20616543487. The next prime is 20616543547. The reversal of 20616543513 is 31534561602.

20616543513 is a `hidden beast` number, since 2 + 0 + 61 + 6 + 543 + 51 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11692529424 + 8924014089 = 108132^2 + 94467^2 .

It is not a de Polignac number, because 20616543513 - 2⁸ = 20616543257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20616543593) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1145363520 + ... + 1145363537.

It is an arithmetic number, because the mean of its divisors is an integer number (4963241959).

Almost surely, 2^20616543513 is an apocalyptic number.

It is an amenable number.

20616543513 is a deficient number, since it is larger than the sum of its proper divisors (9162908241).

20616543513 is a wasteful number, since it uses less digits than its factorization.

20616543513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290727063 (or 2290727060 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 20616543513 in words is "twenty billion, six hundred sixteen million, five hundred forty-three thousand, five hundred thirteen".