4128992661 has 4 divisors (see below), whose sum is σ = 5505323552. Its totient is φ = 2752661772.

The previous prime is 4128992627. The next prime is 4128992671. The reversal of 4128992661 is 1662998214.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4128992661 - 2⁶ = 4128992597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4128992661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4128992611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688165441 + ... + 688165446.

It is an arithmetic number, because the mean of its divisors is an integer number (1376330888).

Almost surely, 2^4128992661 is an apocalyptic number.

It is an amenable number.

4128992661 is a deficient number, since it is larger than the sum of its proper divisors (1376330891).

4128992661 is a wasteful number, since it uses less digits than its factorization.

4128992661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376330890.

The product of its digits is 373248, while the sum is 48.

The square root of 4128992661 is about 64257.2381992877. The cubic root of 4128992661 is about 1604.2844364135.

The spelling of 4128992661 in words is "four billion, one hundred twenty-eight million, nine hundred ninety-two thousand, six hundred sixty-one".