81258763100 has 36 divisors (see below), whose sum is σ = 183998108784. Its totient is φ = 31090308480.

The previous prime is 81258763049. The next prime is 81258763129. The reversal of 81258763100 is 136785218.

It is a super-2 number, since 2×81258763100² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17662649 + ... + 17667248.

Almost surely, 2^81258763100 is an apocalyptic number.

It is an amenable number.

81258763100 is an abundant number, since it is smaller than the sum of its proper divisors (102739345684).

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

81258763100 is a wasteful number, since it uses less digits than its factorization.

81258763100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35329934 (or 35329927 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 81258763100 in words is "eighty-one billion, two hundred fifty-eight million, seven hundred sixty-three thousand, one hundred".