55949247581 has 4 divisors (see below), whose sum is σ = 57139657152. Its totient is φ = 54758838012.

The previous prime is 55949247551. The next prime is 55949247589. The reversal of 55949247581 is 18574294955.

55949247581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 55949247581 - 2¹⁴ = 55949231197 is a prime.

It is a super-2 number, since 2×55949247581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55949247581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55949247589) 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, 595204715 + ... + 595204808.

It is an arithmetic number, because the mean of its divisors is an integer number (14284914288).

Almost surely, 2^55949247581 is an apocalyptic number.

It is an amenable number.

55949247581 is a deficient number, since it is larger than the sum of its proper divisors (1190409571).

55949247581 is a wasteful number, since it uses less digits than its factorization.

55949247581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190409570.

The product of its digits is 18144000, while the sum is 59.

The spelling of 55949247581 in words is "fifty-five billion, nine hundred forty-nine million, two hundred forty-seven thousand, five hundred eighty-one".