81029623085 has 8 divisors (see below), whose sum is σ = 97264654080. Its totient is φ = 64804294224.

The previous prime is 81029623061. The next prime is 81029623091. The reversal of 81029623085 is 58032692018.

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 81029623085 - 2³⁴ = 63849753901 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2407145 + ... + 2440574.

It is an arithmetic number, because the mean of its divisors is an integer number (12158081760).

Almost surely, 2^81029623085 is an apocalyptic number.

It is an amenable number.

81029623085 is a deficient number, since it is larger than the sum of its proper divisors (16235030995).

81029623085 is a wasteful number, since it uses less digits than its factorization.

81029623085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851067.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 81029623085 in words is "eighty-one billion, twenty-nine million, six hundred twenty-three thousand, eighty-five".