81630291030 has 32 divisors (see below), whose sum is σ = 195978197088. Its totient is φ = 21760800000.

The previous prime is 81630290939. The next prime is 81630291031. The reversal of 81630291030 is 3019203618.

It is a junction number, because it is equal to n+sod(n) for n = 81630290982 and 81630291000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81630291031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363321 + ... + 543380.

It is an arithmetic number, because the mean of its divisors is an integer number (6124318659).

Almost surely, 2^81630291030 is an apocalyptic number.

81630291030 is an abundant number, since it is smaller than the sum of its proper divisors (114347906058).

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

81630291030 is a wasteful number, since it uses less digits than its factorization.

81630291030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909712.

The product of its (nonzero) digits is 7776, while the sum is 33.

Adding to 81630291030 its reverse (3019203618), we get a palindrome (84649494648).

The spelling of 81630291030 in words is "eighty-one billion, six hundred thirty million, two hundred ninety-one thousand, thirty".