84666239901 has 20 divisors (see below), whose sum is σ = 133916538492. Its totient is φ = 53123914368.

The previous prime is 84666239863. The next prime is 84666239921. The reversal of 84666239901 is 10993266648.

It can be written as a sum of positive squares in 2 ways, for example, as 58987779876 + 25678460025 = 242874^2 + 160245^2 .

It is not a de Polignac number, because 84666239901 - 2⁷ = 84666239773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84666239921) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30741630 + ... + 30744383.

Almost surely, 2^84666239901 is an apocalyptic number.

84666239901 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

84666239901 is a deficient number, since it is larger than the sum of its proper divisors (49250298591).

84666239901 is a wasteful number, since it uses less digits than its factorization.

84666239901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61486042 (or 61486033 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 84666239901 in words is "eighty-four billion, six hundred sixty-six million, two hundred thirty-nine thousand, nine hundred one".