84171147642 has 12 divisors (see below), whose sum is σ = 182370819930. Its totient is φ = 28057049208.

The previous prime is 84171147631. The next prime is 84171147649. The reversal of 84171147642 is 24674117148.

84171147642 is a `hidden beast` number, since 8 + 4 + 171 + 1 + 476 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 49186811961 + 34984335681 = 221781^2 + 187041^2 .

It is not an unprimeable number, because it can be changed into a prime (84171147649) 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, 2338087417 + ... + 2338087452.

Almost surely, 2^84171147642 is an apocalyptic number.

84171147642 is an abundant number, since it is smaller than the sum of its proper divisors (98199672288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84171147642 is a wasteful number, since it uses less digits than its factorization.

84171147642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676174877 (or 4676174874 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The spelling of 84171147642 in words is "eighty-four billion, one hundred seventy-one million, one hundred forty-seven thousand, six hundred forty-two".