80438780856555 has 48 divisors (see below), whose sum is σ = 152116919136000. Its totient is φ = 38996903803200.

The previous prime is 80438780856541. The next prime is 80438780856557. The reversal of 80438780856555 is 55565808783408.

80438780856555 is a `hidden beast` number, since 8 + 0 + 4 + 3 + 8 + 7 + 8 + 0 + 8 + 565 + 55 = 666.

It is not a de Polignac number, because 80438780856555 - 2⁴¹ = 78239757601003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80438780856557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2541951 + ... + 12935960.

It is an arithmetic number, because the mean of its divisors is an integer number (3169102482000).

Almost surely, 2^{80438780856555} is an apocalyptic number.

80438780856555 is a deficient number, since it is larger than the sum of its proper divisors (71678138279445).

80438780856555 is a wasteful number, since it uses less digits than its factorization.

80438780856555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15488432 (or 15488429 counting only the distinct ones).

The product of its (nonzero) digits is 1290240000, while the sum is 72.

The spelling of 80438780856555 in words is "eighty trillion, four hundred thirty-eight billion, seven hundred eighty million, eight hundred fifty-six thousand, five hundred fifty-five".