81751573030 has 32 divisors (see below), whose sum is σ = 157820335200. Its totient is φ = 30395020032.

The previous prime is 81751572989. The next prime is 81751573031. The reversal of 81751573030 is 3037515718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81751573031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4049095 + ... + 4069234.

It is an arithmetic number, because the mean of its divisors is an integer number (4931885475).

Almost surely, 2^81751573030 is an apocalyptic number.

81751573030 is a deficient number, since it is larger than the sum of its proper divisors (76068762170).

81751573030 is a wasteful number, since it uses less digits than its factorization.

81751573030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8118408.

The product of its (nonzero) digits is 88200, while the sum is 40.

The spelling of 81751573030 in words is "eighty-one billion, seven hundred fifty-one million, five hundred seventy-three thousand, thirty".