55641643663450 has 36 divisors (see below), whose sum is σ = 112066879722138. Its totient is φ = 20544606888000.

The previous prime is 55641643663391. The next prime is 55641643663513. The reversal of 55641643663450 is 5436634614655.

It can be written as a sum of positive squares in 9 ways, for example, as 25294039681 + 55616349623769 = 159041^2 + 7457637^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3292396501 + ... + 3292413400.

Almost surely, 2^{55641643663450} is an apocalyptic number.

55641643663450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55641643663450 is an abundant number, since it is smaller than the sum of its proper divisors (56425236058688).

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

55641643663450 is a wasteful number, since it uses less digits than its factorization.

55641643663450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6584809939 (or 6584809921 counting only the distinct ones).

The product of its (nonzero) digits is 93312000, while the sum is 58.

The spelling of 55641643663450 in words is "fifty-five trillion, six hundred forty-one billion, six hundred forty-three million, six hundred sixty-three thousand, four hundred fifty".