2521740857 has 4 divisors (see below), whose sum is σ = 2654464080. Its totient is φ = 2389017636.

The previous prime is 2521740853. The next prime is 2521740899. The reversal of 2521740857 is 7580471252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2521740857 - 2² = 2521740853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521740853) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 66361583 + ... + 66361620.

It is an arithmetic number, because the mean of its divisors is an integer number (663616020).

Almost surely, 2^2521740857 is an apocalyptic number.

It is an amenable number.

2521740857 is a deficient number, since it is larger than the sum of its proper divisors (132723223).

2521740857 is a wasteful number, since it uses less digits than its factorization.

2521740857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132723222.

The product of its (nonzero) digits is 156800, while the sum is 41.

The square root of 2521740857 is about 50216.9379492617. The cubic root of 2521740857 is about 1361.1317095630.

The spelling of 2521740857 in words is "two billion, five hundred twenty-one million, seven hundred forty thousand, eight hundred fifty-seven".