4721736643506 has 24 divisors (see below), whose sum is σ = 10398141353964. Its totient is φ = 1548110374560.

The previous prime is 4721736643483. The next prime is 4721736643513. The reversal of 4721736643506 is 6053466371274.

4721736643506 is a `hidden beast` number, since 4 + 7 + 2 + 1 + 73 + 6 + 64 + 3 + 506 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3168610043481 + 1553126600025 = 1780059^2 + 1246245^2 .

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, 2150152201 + ... + 2150154396.

Almost surely, 2^{4721736643506} is an apocalyptic number.

4721736643506 is an abundant number, since it is smaller than the sum of its proper divisors (5676404710458).

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

4721736643506 is a wasteful number, since it uses less digits than its factorization.

4721736643506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4300306666 (or 4300306663 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 54.

The spelling of 4721736643506 in words is "four trillion, seven hundred twenty-one billion, seven hundred thirty-six million, six hundred forty-three thousand, five hundred six".