2506772821 has 12 divisors (see below), whose sum is σ = 2918262060. Its totient is φ = 2147026560.

The previous prime is 2506772813. The next prime is 2506772881. The reversal of 2506772821 is 1282776052.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1025600625 + 1481172196 = 32025^2 + 38486^2 .

It is not a de Polignac number, because 2506772821 - 2³ = 2506772813 is a prime.

It is a super-2 number, since 2×2506772821² = 12567819952208596082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2506772881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47895 + ... + 85483.

It is an arithmetic number, because the mean of its divisors is an integer number (243188505).

Almost surely, 2^2506772821 is an apocalyptic number.

It is an amenable number.

2506772821 is a deficient number, since it is larger than the sum of its proper divisors (411489239).

2506772821 is a wasteful number, since it uses less digits than its factorization.

2506772821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38964 (or 38957 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 2506772821 is about 50067.6824009260. The cubic root of 2506772821 is about 1358.4333208175.

The spelling of 2506772821 in words is "two billion, five hundred six million, seven hundred seventy-two thousand, eight hundred twenty-one".