81142252070 has 32 divisors (see below), whose sum is σ = 159852946176. Its totient is φ = 29410149600.

The previous prime is 81142252019. The next prime is 81142252127. The reversal of 81142252070 is 7025224118.

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, 1167626 + ... + 1235165.

It is an arithmetic number, because the mean of its divisors is an integer number (4995404568).

Almost surely, 2^81142252070 is an apocalyptic number.

81142252070 is a deficient number, since it is larger than the sum of its proper divisors (78710694106).

81142252070 is a wasteful number, since it uses less digits than its factorization.

81142252070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403116.

The product of its (nonzero) digits is 8960, while the sum is 32.

Adding to 81142252070 its reverse (7025224118), we get a palindrome (88167476188).

The spelling of 81142252070 in words is "eighty-one billion, one hundred forty-two million, two hundred fifty-two thousand, seventy".