866772481 has 9 divisors (see below), whose sum is σ = 883483041. Its totient is φ = 850373844.

The previous prime is 866772461. The next prime is 866772541. The reversal of 866772481 is 184277668.

It is a happy number.

The square root of 866772481 is 29441.

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

It is a de Polignac number, because none of the positive numbers 2^k-866772481 is a prime.

It is a super-2 number, since 2×866772481² = 1502589067637790722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866772451) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1736770 + ... + 1737268.

Almost surely, 2^866772481 is an apocalyptic number.

866772481 is the 29441-st square number.

866772481 is the 14721-st centered octagonal number.

It is an amenable number.

866772481 is a deficient number, since it is larger than the sum of its proper divisors (16710560).

866772481 is an frugal number, since it uses more digits than its factorization.

866772481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 558 counting only the distinct ones).

The product of its digits is 903168, while the sum is 49.

The cubic root of 866772481 is about 953.4583025111.

Multiplying 866772481 by its sum of digits (49), we get a square (42471851569 = 206087²).

The spelling of 866772481 in words is "eight hundred sixty-six million, seven hundred seventy-two thousand, four hundred eighty-one".