2187564657812 has 6 divisors (see below), whose sum is σ = 3828238151178. Its totient is φ = 1093782328904.

The previous prime is 2187564657797. The next prime is 2187564657841.

2187564657812 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 2066964037636 + 120600620176 = 1437694^2 + 347276^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 273445582223 + ... + 273445582230.

It is an arithmetic number, because the mean of its divisors is an integer number (638039691863).

Almost surely, 2^{2187564657812} is an apocalyptic number.

It is an amenable number.

2187564657812 is a deficient number, since it is larger than the sum of its proper divisors (1640673493366).

2187564657812 is a wasteful number, since it uses less digits than its factorization.

2187564657812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546891164457 (or 546891164455 counting only the distinct ones).

The product of its digits is 45158400, while the sum is 62.

The spelling of 2187564657812 in words is "two trillion, one hundred eighty-seven billion, five hundred sixty-four million, six hundred fifty-seven thousand, eight hundred twelve".