2775251664 has 30 divisors (see below), whose sum is σ = 7766850546. Its totient is φ = 925083840.

The previous prime is 2775251653. The next prime is 2775251671. The reversal of 2775251664 is 4661525772.

2775251664 is a `hidden beast` number, since 2 + 7 + 75 + 2 + 516 + 64 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1698099264 + 1077152400 = 41208^2 + 32820^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9636147 + ... + 9636434.

Almost surely, 2^2775251664 is an apocalyptic number.

2775251664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2775251664 is an abundant number, since it is smaller than the sum of its proper divisors (4991598882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2775251664 is a wasteful number, since it uses less digits than its factorization.

2775251664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19272595 (or 19272586 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The square root of 2775251664 is about 52680.6573990872. The cubic root of 2775251664 is about 1405.2948582239.

The spelling of 2775251664 in words is "two billion, seven hundred seventy-five million, two hundred fifty-one thousand, six hundred sixty-four".