81151894741 has 8 divisors (see below), whose sum is σ = 81307586304. Its totient is φ = 80996263680.

The previous prime is 81151894697. The next prime is 81151894757. The reversal of 81151894741 is 14749815118.

It is a happy number.

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-81151894741 is a prime.

It is a super-3 number, since 3×81151894741³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81151894141) 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, 3387381 + ... + 3411253.

It is an arithmetic number, because the mean of its divisors is an integer number (10163448288).

Almost surely, 2^81151894741 is an apocalyptic number.

It is an amenable number.

81151894741 is a deficient number, since it is larger than the sum of its proper divisors (155691563).

81151894741 is a wasteful number, since it uses less digits than its factorization.

81151894741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30251.

The product of its digits is 322560, while the sum is 49.

The spelling of 81151894741 in words is "eighty-one billion, one hundred fifty-one million, eight hundred ninety-four thousand, seven hundred forty-one".