83121327685740 has 24 divisors (see below), whose sum is σ = 232739717520240. Its totient is φ = 22165687382848.

The previous prime is 83121327685729. The next prime is 83121327685741. The reversal of 83121327685740 is 4758672312138.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (83121327685741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 692677730655 + ... + 692677730774.

It is an arithmetic number, because the mean of its divisors is an integer number (9697488230010).

Almost surely, 2^{83121327685740} is an apocalyptic number.

It is an amenable number.

83121327685740 is an abundant number, since it is smaller than the sum of its proper divisors (149618389834500).

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

83121327685740 is a wasteful number, since it uses less digits than its factorization.

83121327685740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385355461441 (or 1385355461439 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 57.

Adding to 83121327685740 its reverse (4758672312138), we get a palindrome (87879999997878).

The spelling of 83121327685740 in words is "eighty-three trillion, one hundred twenty-one billion, three hundred twenty-seven million, six hundred eighty-five thousand, seven hundred forty".