81675040125 has 64 divisors (see below), whose sum is σ = 164459303424. Its totient is φ = 35140838400.

The previous prime is 81675040081. The next prime is 81675040127. The reversal of 81675040125 is 52104057618.

It is not a de Polignac number, because 81675040125 - 2²¹ = 81672942973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81675040127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 870502 + ... + 959751.

It is an arithmetic number, because the mean of its divisors is an integer number (2569676616).

Almost surely, 2^81675040125 is an apocalyptic number.

81675040125 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81675040125 is an abundant number, since it is smaller than the sum of its proper divisors (82784263299).

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

81675040125 is a wasteful number, since it uses less digits than its factorization.

81675040125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830295 (or 1830285 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 81675040125 in words is "eighty-one billion, six hundred seventy-five million, forty thousand, one hundred twenty-five".