1564986978660 has 192 divisors, whose sum is σ = 5018290421760. Its totient is φ = 356974248960.

The previous prime is 1564986978631. The next prime is 1564986978713. The reversal of 1564986978660 is 668796894651.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 698965821 + ... + 698968059.

It is an arithmetic number, because the mean of its divisors is an integer number (26136929280).

Almost surely, 2^{1564986978660} is an apocalyptic number.

1564986978660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1564986978660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2509145210880).

1564986978660 is an abundant number, since it is smaller than the sum of its proper divisors (3453303443100).

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

1564986978660 is a wasteful number, since it uses less digits than its factorization.

1564986978660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4946 (or 4944 counting only the distinct ones).

The product of its (nonzero) digits is 940584960, while the sum is 75.

The spelling of 1564986978660 in words is "one trillion, five hundred sixty-four billion, nine hundred eighty-six million, nine hundred seventy-eight thousand, six hundred sixty".