4371728661 has 6 divisors (see below), whose sum is σ = 6314719190. Its totient is φ = 2914485768.

The previous prime is 4371728629. The next prime is 4371728701. The reversal of 4371728661 is 1668271734.

It can be written as a sum of positive squares in only one way, i.e., 3421548036 + 950180625 = 58494^2 + 30825^2 .

It is not a de Polignac number, because 4371728661 - 2⁵ = 4371728629 is a prime.

It is a super-2 number, since 2×4371728661² = 38224022970817705842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4371724661) 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, 242873806 + ... + 242873823.

Almost surely, 2^4371728661 is an apocalyptic number.

It is an amenable number.

4371728661 is a deficient number, since it is larger than the sum of its proper divisors (1942990529).

4371728661 is a wasteful number, since it uses less digits than its factorization.

4371728661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485747635 (or 485747632 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 4371728661 is about 66119.0491537802. The cubic root of 4371728661 is about 1635.1254051891.

The spelling of 4371728661 in words is "four billion, three hundred seventy-one million, seven hundred twenty-eight thousand, six hundred sixty-one".