2155555544 has 8 divisors (see below), whose sum is σ = 4041666660. Its totient is φ = 1077777768.

The previous prime is 2155555517. The next prime is 2155555603. The reversal of 2155555544 is 4455555512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134722214 + ... + 134722229.

Almost surely, 2^2155555544 is an apocalyptic number.

It is an amenable number.

2155555544 is a deficient number, since it is larger than the sum of its proper divisors (1886111116).

2155555544 is a wasteful number, since it uses less digits than its factorization.

2155555544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269444449 (or 269444445 counting only the distinct ones).

The product of its digits is 500000, while the sum is 41.

The square root of 2155555544 is about 46427.9607995010. The cubic root of 2155555544 is about 1291.7736042845.

The spelling of 2155555544 in words is "two billion, one hundred fifty-five million, five hundred fifty-five thousand, five hundred forty-four".