81425145601 has 8 divisors (see below), whose sum is σ = 87801184800. Its totient is φ = 75258156960.

The previous prime is 81425145523. The next prime is 81425145611. The reversal of 81425145601 is 10654152418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81425145601 is a prime.

It is a super-2 number, since 2×81425145601² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81425145611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52261831 + ... + 52263388.

It is an arithmetic number, because the mean of its divisors is an integer number (10975148100).

Almost surely, 2^81425145601 is an apocalyptic number.

It is an amenable number.

81425145601 is a deficient number, since it is larger than the sum of its proper divisors (6376039199).

81425145601 is a wasteful number, since it uses less digits than its factorization.

81425145601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104525279.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 81425145601 in words is "eighty-one billion, four hundred twenty-five million, one hundred forty-five thousand, six hundred one".