81550029601 has 8 divisors (see below), whose sum is σ = 81625684544. Its totient is φ = 81474407280.

The previous prime is 81550029521. The next prime is 81550029629. The reversal of 81550029601 is 10692005518.

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 81550029601 - 2¹¹ = 81550027553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81550029901) 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, 9394075 + ... + 9402751.

It is an arithmetic number, because the mean of its divisors is an integer number (10203210568).

Almost surely, 2^81550029601 is an apocalyptic number.

It is an amenable number.

81550029601 is a deficient number, since it is larger than the sum of its proper divisors (75654943).

81550029601 is a wasteful number, since it uses less digits than its factorization.

81550029601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16311.

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 81550029601 in words is "eighty-one billion, five hundred fifty million, twenty-nine thousand, six hundred one".