1538772642864 has 120 divisors (see below), whose sum is σ = 4478008523040. Its totient is φ = 492670918656.

The previous prime is 1538772642839. The next prime is 1538772642877. The reversal of 1538772642864 is 4682462778351.

1538772642864 is a `hidden beast` number, since 1 + 5 + 3 + 87 + 72 + 6 + 428 + 64 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148644 + ... + 1760579.

It is an arithmetic number, because the mean of its divisors is an integer number (37316737692).

Almost surely, 2^{1538772642864} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1538772642864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2239004261520).

1538772642864 is an abundant number, since it is smaller than the sum of its proper divisors (2939235880176).

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

1538772642864 is a wasteful number, since it uses less digits than its factorization.

1538772642864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909459 (or 1909450 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 63.

The spelling of 1538772642864 in words is "one trillion, five hundred thirty-eight billion, seven hundred seventy-two million, six hundred forty-two thousand, eight hundred sixty-four".