82640234752538 has 4 divisors (see below), whose sum is σ = 123960352128810. Its totient is φ = 41320117376268.

The previous prime is 82640234752519. The next prime is 82640234752547. The reversal of 82640234752538 is 83525743204628.

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

It can be written as a sum of positive squares in only one way, i.e., 70477250675329 + 12162984077209 = 8395073^2 + 3487547^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20660058688133 + ... + 20660058688136.

Almost surely, 2^{82640234752538} is an apocalyptic number.

82640234752538 is a deficient number, since it is larger than the sum of its proper divisors (41320117376272).

82640234752538 is a wasteful number, since it uses less digits than its factorization.

82640234752538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41320117376271.

The product of its (nonzero) digits is 77414400, while the sum is 59.

The spelling of 82640234752538 in words is "eighty-two trillion, six hundred forty billion, two hundred thirty-four million, seven hundred fifty-two thousand, five hundred thirty-eight".