55521457685 has 8 divisors (see below), whose sum is σ = 66993848376. Its totient is φ = 44171766720.

The previous prime is 55521457681. The next prime is 55521457697. The reversal of 55521457685 is 58675412555.

It can be written as a sum of positive squares in 4 ways, for example, as 2115172081 + 53406285604 = 45991^2 + 231098^2 .

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

It is not a de Polignac number, because 55521457685 - 2² = 55521457681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55521457681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30673934 + ... + 30675743.

It is an arithmetic number, because the mean of its divisors is an integer number (8374231047).

Almost surely, 2^55521457685 is an apocalyptic number.

It is an amenable number.

55521457685 is a deficient number, since it is larger than the sum of its proper divisors (11472390691).

55521457685 is a wasteful number, since it uses less digits than its factorization.

55521457685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61349863.

The product of its digits is 8400000, while the sum is 53.

The spelling of 55521457685 in words is "fifty-five billion, five hundred twenty-one million, four hundred fifty-seven thousand, six hundred eighty-five".