81030590657 has 8 divisors (see below), whose sum is σ = 86149013184. Its totient is φ = 76045114288.

The previous prime is 81030590633. The next prime is 81030590659. The reversal of 81030590657 is 75609503018.

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 81030590657 - 2²⁶ = 80963481793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81030590659) 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, 33235283 + ... + 33237720.

It is an arithmetic number, because the mean of its divisors is an integer number (10768626648).

Almost surely, 2^81030590657 is an apocalyptic number.

It is an amenable number.

81030590657 is a deficient number, since it is larger than the sum of its proper divisors (5118422527).

81030590657 is a wasteful number, since it uses less digits than its factorization.

81030590657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66473079.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 81030590657 in words is "eighty-one billion, thirty million, five hundred ninety thousand, six hundred fifty-seven".