81615625282 has 8 divisors (see below), whose sum is σ = 122450082876. Its totient is φ = 40798930992.

The previous prime is 81615625249. The next prime is 81615625283. The reversal of 81615625282 is 28252651618.

It can be written as a sum of positive squares in 2 ways, for example, as 70213870441 + 11401754841 = 264979^2 + 106779^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81615625282² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81615625283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4429333 + ... + 4447720.

Almost surely, 2^81615625282 is an apocalyptic number.

81615625282 is a deficient number, since it is larger than the sum of its proper divisors (40834457594).

81615625282 is a wasteful number, since it uses less digits than its factorization.

81615625282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8881652.

The product of its digits is 460800, while the sum is 46.

The spelling of 81615625282 in words is "eighty-one billion, six hundred fifteen million, six hundred twenty-five thousand, two hundred eighty-two".