81029251152 has 40 divisors (see below), whose sum is σ = 232583962880. Its totient is φ = 27009750240.

The previous prime is 81029251133. The next prime is 81029251169. The reversal of 81029251152 is 25115292018.

81029251152 is a `hidden beast` number, since 8 + 1 + 0 + 2 + 92 + 511 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93783424 + ... + 93784287.

It is an arithmetic number, because the mean of its divisors is an integer number (5814599072).

Almost surely, 2^81029251152 is an apocalyptic number.

It is an amenable number.

81029251152 is an abundant number, since it is smaller than the sum of its proper divisors (151554711728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81029251152 is a wasteful number, since it uses less digits than its factorization.

81029251152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187567728 (or 187567716 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 81029251152 in words is "eighty-one billion, twenty-nine million, two hundred fifty-one thousand, one hundred fifty-two".