1928239861065 has 32 divisors (see below), whose sum is σ = 3568405349376. Its totient is φ = 870860821440.

The previous prime is 1928239861061. The next prime is 1928239861189. The reversal of 1928239861065 is 5601689328291.

It is not a de Polignac number, because 1928239861065 - 2² = 1928239861061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1928239861061) 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, 110618931 + ... + 110636360.

It is an arithmetic number, because the mean of its divisors is an integer number (111512667168).

Almost surely, 2^{1928239861065} is an apocalyptic number.

1928239861065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1928239861065 is a deficient number, since it is larger than the sum of its proper divisors (1640165488311).

1928239861065 is a wasteful number, since it uses less digits than its factorization.

1928239861065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221255389.

The product of its (nonzero) digits is 11197440, while the sum is 60.

The spelling of 1928239861065 in words is "one trillion, nine hundred twenty-eight billion, two hundred thirty-nine million, eight hundred sixty-one thousand, sixty-five".