4974287156721 has 27 divisors (see below), whose sum is σ = 7202879408673. Its totient is φ = 3307997275200.

The previous prime is 4974287156647. The next prime is 4974287156747. The reversal of 4974287156721 is 1276517824794.

The square root of 4974287156721 is 2230311.

It is a perfect power (a square), and thus also a powerful number.

4974287156721 is a `hidden beast` number, since 4 + 9 + 7 + 42 + 8 + 7 + 1 + 567 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1785791232225 + 3188495924496 = 1336335^2 + 1785636^2 .

It is not a de Polignac number, because 4974287156721 - 2⁷ = 4974287156593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4974287156521) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4021250115 + ... + 4021251351.

Almost surely, 2^{4974287156721} is an apocalyptic number.

4974287156721 is the 2230311-st square number.

4974287156721 is the 1115156-th centered octagonal number.

It is an amenable number.

4974287156721 is a deficient number, since it is larger than the sum of its proper divisors (2228592251952).

4974287156721 is an frugal number, since it uses more digits than its factorization.

4974287156721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3682 (or 1841 counting only the distinct ones).

The product of its digits is 47416320, while the sum is 63.

The spelling of 4974287156721 in words is "four trillion, nine hundred seventy-four billion, two hundred eighty-seven million, one hundred fifty-six thousand, seven hundred twenty-one".