81623777201 has 8 divisors (see below), whose sum is σ = 84316646400. Its totient is φ = 78934648320.

The previous prime is 81623777167. The next prime is 81623777251. The reversal of 81623777201 is 10277732618.

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 81623777201 - 2¹⁰ = 81623776177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81623777251) 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, 890681 + ... + 978038.

It is an arithmetic number, because the mean of its divisors is an integer number (10539580800).

Almost surely, 2^81623777201 is an apocalyptic number.

It is an amenable number.

81623777201 is a deficient number, since it is larger than the sum of its proper divisors (2692869199).

81623777201 is a wasteful number, since it uses less digits than its factorization.

81623777201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870159.

The product of its (nonzero) digits is 197568, while the sum is 44.

The spelling of 81623777201 in words is "eighty-one billion, six hundred twenty-three million, seven hundred seventy-seven thousand, two hundred one".