81143352470 has 32 divisors (see below), whose sum is σ = 146355206400. Its totient is φ = 32391370240.

The previous prime is 81143352461. The next prime is 81143352491. The reversal of 81143352470 is 7425334118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13870106 + ... + 13875954.

It is an arithmetic number, because the mean of its divisors is an integer number (4573600200).

Almost surely, 2^81143352470 is an apocalyptic number.

81143352470 is a deficient number, since it is larger than the sum of its proper divisors (65211853930).

81143352470 is a wasteful number, since it uses less digits than its factorization.

81143352470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8440.

The product of its (nonzero) digits is 80640, while the sum is 38.

Adding to 81143352470 its reverse (7425334118), we get a palindrome (88568686588).

The spelling of 81143352470 in words is "eighty-one billion, one hundred forty-three million, three hundred fifty-two thousand, four hundred seventy".