81390153479 has 8 divisors (see below), whose sum is σ = 86203165248. Its totient is φ = 76579959040.

The previous prime is 81390153463. The next prime is 81390153487. The reversal of 81390153479 is 97435109318.

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 81390153479 - 2⁴ = 81390153463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81390153409) 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, 644702 + ... + 760539.

It is an arithmetic number, because the mean of its divisors is an integer number (10775395656).

Almost surely, 2^81390153479 is an apocalyptic number.

81390153479 is a deficient number, since it is larger than the sum of its proper divisors (4813011769).

81390153479 is a wasteful number, since it uses less digits than its factorization.

81390153479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408665.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 81390153479 in words is "eighty-one billion, three hundred ninety million, one hundred fifty-three thousand, four hundred seventy-nine".