81780552167 has 8 divisors (see below), whose sum is σ = 81929520000. Its totient is φ = 81631632384.

The previous prime is 81780552157. The next prime is 81780552181. The reversal of 81780552167 is 76125508718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81780552167 - 2¹⁴ = 81780535783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81780552157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6165959 + ... + 6179207.

It is an arithmetic number, because the mean of its divisors is an integer number (10241190000).

Almost surely, 2^81780552167 is an apocalyptic number.

81780552167 is a deficient number, since it is larger than the sum of its proper divisors (148967833).

81780552167 is a wasteful number, since it uses less digits than its factorization.

81780552167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24025.

The product of its (nonzero) digits is 940800, while the sum is 50.

The spelling of 81780552167 in words is "eighty-one billion, seven hundred eighty million, five hundred fifty-two thousand, one hundred sixty-seven".