81461400330 has 32 divisors (see below), whose sum is σ = 195522465600. Its totient is φ = 21721361792.

The previous prime is 81461400329. The next prime is 81461400341. The reversal of 81461400330 is 3300416418.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317806 + ... + 513734.

It is an arithmetic number, because the mean of its divisors is an integer number (6110077050).

Almost surely, 2^81461400330 is an apocalyptic number.

81461400330 is an abundant number, since it is smaller than the sum of its proper divisors (114061065270).

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

81461400330 is a wasteful number, since it uses less digits than its factorization.

81461400330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209798.

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 81461400330 its reverse (3300416418), we get a palindrome (84761816748).

The spelling of 81461400330 in words is "eighty-one billion, four hundred sixty-one million, four hundred thousand, three hundred thirty".