81002035625 has 40 divisors (see below), whose sum is σ = 122484992256. Its totient is φ = 52276896000.

The previous prime is 81002035613. The next prime is 81002035657. The reversal of 81002035625 is 52653020018.

It is not a de Polignac number, because 81002035625 - 2⁶ = 81002035561 is a prime.

It is a super-2 number, since 2×81002035625² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81002035591 and 81002035600.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 470177 + ... + 618926.

Almost surely, 2^81002035625 is an apocalyptic number.

81002035625 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81002035625 is a deficient number, since it is larger than the sum of its proper divisors (41482956631).

81002035625 is a wasteful number, since it uses less digits than its factorization.

81002035625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089147 (or 1089132 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 81002035625 in words is "eighty-one billion, two million, thirty-five thousand, six hundred twenty-five".