81292552599 has 4 divisors (see below), whose sum is σ = 108390070136. Its totient is φ = 54195035064.

The previous prime is 81292552567. The next prime is 81292552643. The reversal of 81292552599 is 99525529218.

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

It is not a de Polignac number, because 81292552599 - 2⁵ = 81292552567 is a prime.

It is a super-4 number, since 4×81292552599⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81292552799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13548758764 + ... + 13548758769.

It is an arithmetic number, because the mean of its divisors is an integer number (27097517534).

Almost surely, 2^81292552599 is an apocalyptic number.

81292552599 is a deficient number, since it is larger than the sum of its proper divisors (27097517537).

81292552599 is a wasteful number, since it uses less digits than its factorization.

81292552599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27097517536.

The product of its digits is 5832000, while the sum is 57.

The spelling of 81292552599 in words is "eighty-one billion, two hundred ninety-two million, five hundred fifty-two thousand, five hundred ninety-nine".