55377881 has 4 divisors (see below), whose sum is σ = 59637732. Its totient is φ = 51118032.

The previous prime is 55377871. The next prime is 55377893. The reversal of 55377881 is 18877355.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22705225 + 32672656 = 4765^2 + 5716^2 .

It is a cyclic number.

It is not a de Polignac number, because 55377881 - 2²² = 51183577 is a prime.

It is a super-2 number, since 2×55377881² = 6133419408100322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55377871) 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, 2129906 + ... + 2129931.

It is an arithmetic number, because the mean of its divisors is an integer number (14909433).

Almost surely, 2^55377881 is an apocalyptic number.

It is an amenable number.

55377881 is a deficient number, since it is larger than the sum of its proper divisors (4259851).

55377881 is a wasteful number, since it uses less digits than its factorization.

55377881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259850.

The product of its digits is 235200, while the sum is 44.

The square root of 55377881 is about 7441.6316087267. The cubic root of 55377881 is about 381.1642065843.

The spelling of 55377881 in words is "fifty-five million, three hundred seventy-seven thousand, eight hundred eighty-one".