55415945 has 12 divisors (see below), whose sum is σ = 72009036. Its totient is φ = 40921920.

The previous prime is 55415933. The next prime is 55415953. The reversal of 55415945 is 54951455.

It can be written as a sum of positive squares in 6 ways, for example, as 27081616 + 28334329 = 5204^2 + 5323^2 .

It is not a de Polignac number, because 55415945 - 2⁴ = 55415929 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55415899 and 55415908.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31946 + ... + 33635.

It is an arithmetic number, because the mean of its divisors is an integer number (6000753).

Almost surely, 2^55415945 is an apocalyptic number.

It is an amenable number.

55415945 is a deficient number, since it is larger than the sum of its proper divisors (16593091).

55415945 is a wasteful number, since it uses less digits than its factorization.

55415945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65612 (or 65599 counting only the distinct ones).

The product of its digits is 90000, while the sum is 38.

The square root of 55415945 is about 7444.1886730523. The cubic root of 55415945 is about 381.2515176863.

The spelling of 55415945 in words is "fifty-five million, four hundred fifteen thousand, nine hundred forty-five".