2157066777 has 16 divisors (see below), whose sum is σ = 3150282240. Its totient is φ = 1306781952.

The previous prime is 2157066773. The next prime is 2157066787. The reversal of 2157066777 is 7776607512.

It is not a de Polignac number, because 2157066777 - 2² = 2157066773 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157066773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 727753 + ... + 730710.

It is an arithmetic number, because the mean of its divisors is an integer number (196892640).

Almost surely, 2^2157066777 is an apocalyptic number.

It is an amenable number.

2157066777 is a deficient number, since it is larger than the sum of its proper divisors (993215463).

2157066777 is a wasteful number, since it uses less digits than its factorization.

2157066777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458512.

The product of its (nonzero) digits is 864360, while the sum is 48.

The square root of 2157066777 is about 46444.2329789178. The cubic root of 2157066777 is about 1292.0754158628.

The spelling of 2157066777 in words is "two billion, one hundred fifty-seven million, sixty-six thousand, seven hundred seventy-seven".