55395660381 has 4 divisors (see below), whose sum is σ = 73860880512. Its totient is φ = 36930440252.

The previous prime is 55395660373. The next prime is 55395660391. The reversal of 55395660381 is 18306659355.

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 55395660381 - 2³ = 55395660373 is a prime.

It is a super-2 number, since 2×55395660381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55395660391) 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, 9232610061 + ... + 9232610066.

It is an arithmetic number, because the mean of its divisors is an integer number (18465220128).

Almost surely, 2^55395660381 is an apocalyptic number.

It is an amenable number.

55395660381 is a deficient number, since it is larger than the sum of its proper divisors (18465220131).

55395660381 is a wasteful number, since it uses less digits than its factorization.

55395660381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18465220130.

The product of its (nonzero) digits is 2916000, while the sum is 51.

The spelling of 55395660381 in words is "fifty-five billion, three hundred ninety-five million, six hundred sixty thousand, three hundred eighty-one".