84111129661 has 4 divisors (see below), whose sum is σ = 90581216572. Its totient is φ = 77641042752.

The previous prime is 84111129643. The next prime is 84111129667. The reversal of 84111129661 is 16692111148.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42104577636 + 42006552025 = 205194^2 + 204955^2 .

It is not a de Polignac number, because 84111129661 - 2⁵ = 84111129629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84111129667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3235043436 + ... + 3235043461.

It is an arithmetic number, because the mean of its divisors is an integer number (22645304143).

Almost surely, 2^84111129661 is an apocalyptic number.

It is an amenable number.

84111129661 is a deficient number, since it is larger than the sum of its proper divisors (6470086911).

84111129661 is a wasteful number, since it uses less digits than its factorization.

84111129661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6470086910.

The product of its digits is 20736, while the sum is 40.

The spelling of 84111129661 in words is "eighty-four billion, one hundred eleven million, one hundred twenty-nine thousand, six hundred sixty-one".