81026177625 has 48 divisors (see below), whose sum is σ = 151099912080. Its totient is φ = 41723808000.

The previous prime is 81026177593. The next prime is 81026177629. The reversal of 81026177625 is 52677162018.

81026177625 is a `hidden beast` number, since 8 + 1 + 0 + 2 + 6 + 17 + 7 + 625 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 10260069264 + 70766108361 = 101292^2 + 266019^2 .

It is not a de Polignac number, because 81026177625 - 2⁵ = 81026177593 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (81026177629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1209156 + ... + 1274405.

It is an arithmetic number, because the mean of its divisors is an integer number (3147914835).

Almost surely, 2^81026177625 is an apocalyptic number.

It is an amenable number.

81026177625 is a deficient number, since it is larger than the sum of its proper divisors (70073734455).

81026177625 is a wasteful number, since it uses less digits than its factorization.

81026177625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2483611 (or 2483598 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 81026177625 in words is "eighty-one billion, twenty-six million, one hundred seventy-seven thousand, six hundred twenty-five".