84772081257538 has 4 divisors (see below), whose sum is σ = 127158121886310. Its totient is φ = 42386040628768.

The previous prime is 84772081257511. The next prime is 84772081257547. The reversal of 84772081257538 is 83575218027748.

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., 73181985294609 + 11590095962929 = 8554647^2 + 3404423^2 .

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 21193020314383 + ... + 21193020314386.

Almost surely, 2^{84772081257538} is an apocalyptic number.

84772081257538 is a deficient number, since it is larger than the sum of its proper divisors (42386040628772).

84772081257538 is a wasteful number, since it uses less digits than its factorization.

84772081257538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42386040628771.

The product of its (nonzero) digits is 210739200, while the sum is 67.

The spelling of 84772081257538 in words is "eighty-four trillion, seven hundred seventy-two billion, eighty-one million, two hundred fifty-seven thousand, five hundred thirty-eight".