1564398843972 has 12 divisors (see below), whose sum is σ = 3650263969296. Its totient is φ = 521466281320.

The previous prime is 1564398843929. The next prime is 1564398843977. The reversal of 1564398843972 is 2793488934651.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1564398843897 and 1564398843906.

It is not an unprimeable number, because it can be changed into a prime (1564398843977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65183285154 + ... + 65183285177.

It is an arithmetic number, because the mean of its divisors is an integer number (304188664108).

Almost surely, 2^{1564398843972} is an apocalyptic number.

1564398843972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1564398843972 is an abundant number, since it is smaller than the sum of its proper divisors (2085865125324).

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

1564398843972 is a wasteful number, since it uses less digits than its factorization.

1564398843972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130366570338 (or 130366570336 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 69.

The spelling of 1564398843972 in words is "one trillion, five hundred sixty-four billion, three hundred ninety-eight million, eight hundred forty-three thousand, nine hundred seventy-two".