55646438401 has 4 divisors (see below), whose sum is σ = 55647099904. Its totient is φ = 55645776900.

The previous prime is 55646438383. The next prime is 55646438413. The reversal of 55646438401 is 10483464655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10483464655 = 5 ⋅2096692931.

It is a cyclic number.

It is not a de Polignac number, because 55646438401 - 2¹⁹ = 55645914113 is a prime.

It is a super-2 number, since 2×55646438401² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55646438101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182385 + ... + 380206.

It is an arithmetic number, because the mean of its divisors is an integer number (13911774976).

Almost surely, 2^55646438401 is an apocalyptic number.

It is an amenable number.

55646438401 is a deficient number, since it is larger than the sum of its proper divisors (661503).

55646438401 is an equidigital number, since it uses as much as digits as its factorization.

55646438401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661502.

The product of its (nonzero) digits is 1382400, while the sum is 46.

The spelling of 55646438401 in words is "fifty-five billion, six hundred forty-six million, four hundred thirty-eight thousand, four hundred one".