81189950568402 has 64 divisors (see below), whose sum is σ = 175498722677376. Its totient is φ = 24891810624000.

The previous prime is 81189950568401. The next prime is 81189950568413. The reversal of 81189950568402 is 20486505998118.

It is not an unprimeable number, because it can be changed into a prime (81189950568401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419331288 + ... + 419524860.

It is an arithmetic number, because the mean of its divisors is an integer number (2742167541834).

Almost surely, 2^{81189950568402} is an apocalyptic number.

81189950568402 is an abundant number, since it is smaller than the sum of its proper divisors (94308772108974).

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

81189950568402 is a wasteful number, since it uses less digits than its factorization.

81189950568402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212875.

The product of its (nonzero) digits is 49766400, while the sum is 66.

The spelling of 81189950568402 in words is "eighty-one trillion, one hundred eighty-nine billion, nine hundred fifty million, five hundred sixty-eight thousand, four hundred two".