163506211633556 has 36 divisors (see below), whose sum is σ = 315886400815860. Its totient is φ = 73996459363200.

The previous prime is 163506211633549. The next prime is 163506211633591. The reversal of 163506211633556 is 655336112605361.

It can be written as a sum of positive squares in 2 ways, for example, as 99185266272400 + 64320945361156 = 9959180^2 + 8020034^2 .

It is a junction number, because it is equal to n+sod(n) for n = 163506211633498 and 163506211633507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 737493425 + ... + 737715096.

It is an arithmetic number, because the mean of its divisors is an integer number (8774622244885).

Almost surely, 2^{163506211633556} is an apocalyptic number.

It is an amenable number.

163506211633556 is a deficient number, since it is larger than the sum of its proper divisors (152380189182304).

163506211633556 is a wasteful number, since it uses less digits than its factorization.

163506211633556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475208776 (or 1475208763 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 53.

The spelling of 163506211633556 in words is "one hundred sixty-three trillion, five hundred six billion, two hundred eleven million, six hundred thirty-three thousand, five hundred fifty-six".