2115555664 has 10 divisors (see below), whose sum is σ = 4098889130. Its totient is φ = 1057777824.

The previous prime is 2115555649. The next prime is 2115555683. The reversal of 2115555664 is 4665555112.

It can be written as a sum of positive squares in only one way, i.e., 2115264064 + 291600 = 45992^2 + 540^2 .

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, 66111099 + ... + 66111130.

It is an arithmetic number, because the mean of its divisors is an integer number (409888913).

Almost surely, 2^2115555664 is an apocalyptic number.

It is an amenable number.

2115555664 is a deficient number, since it is larger than the sum of its proper divisors (1983333466).

2115555664 is a wasteful number, since it uses less digits than its factorization.

2115555664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132222237 (or 132222231 counting only the distinct ones).

The product of its digits is 180000, while the sum is 40.

The square root of 2115555664 is about 45995.1700072953. The cubic root of 2115555664 is about 1283.7333355379.

The spelling of 2115555664 in words is "two billion, one hundred fifteen million, five hundred fifty-five thousand, six hundred sixty-four".