55521205431 has 8 divisors (see below), whose sum is σ = 74029536624. Its totient is φ = 37013505600.

The previous prime is 55521205427. The next prime is 55521205457. The reversal of 55521205431 is 13450212555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55521205431 - 2² = 55521205427 is a prime.

It is a super-2 number, since 2×55521205431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55521205392 and 55521205401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55521205231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114465 + ... + 352341.

It is an arithmetic number, because the mean of its divisors is an integer number (9253692078).

Almost surely, 2^55521205431 is an apocalyptic number.

55521205431 is a deficient number, since it is larger than the sum of its proper divisors (18508331193).

55521205431 is a wasteful number, since it uses less digits than its factorization.

55521205431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315681.

The product of its (nonzero) digits is 30000, while the sum is 33.

Adding to 55521205431 its reverse (13450212555), we get a palindrome (68971417986).

The spelling of 55521205431 in words is "fifty-five billion, five hundred twenty-one million, two hundred five thousand, four hundred thirty-one".