55911578381 has 4 divisors (see below), whose sum is σ = 55919237472. Its totient is φ = 55903919292.

The previous prime is 55911578357. The next prime is 55911578399. The reversal of 55911578381 is 18387511955.

55911578381 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 a de Polignac number, because none of the positive numbers 2^k-55911578381 is a prime.

It is a super-2 number, since 2×55911578381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55911538381) 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, 3818585 + ... + 3833198.

It is an arithmetic number, because the mean of its divisors is an integer number (13979809368).

Almost surely, 2^55911578381 is an apocalyptic number.

It is an amenable number.

55911578381 is a deficient number, since it is larger than the sum of its proper divisors (7659091).

55911578381 is an equidigital number, since it uses as much as digits as its factorization.

55911578381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7659090.

The product of its digits is 1512000, while the sum is 53.

The spelling of 55911578381 in words is "fifty-five billion, nine hundred eleven million, five hundred seventy-eight thousand, three hundred eighty-one".