2516021857 has 4 divisors (see below), whose sum is σ = 2648444080. Its totient is φ = 2383599636.

The previous prime is 2516021843. The next prime is 2516021863. The reversal of 2516021857 is 7581206152.

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 2516021857 - 2¹¹ = 2516019809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2516021887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66211083 + ... + 66211120.

It is an arithmetic number, because the mean of its divisors is an integer number (662111020).

Almost surely, 2^2516021857 is an apocalyptic number.

It is an amenable number.

2516021857 is a deficient number, since it is larger than the sum of its proper divisors (132422223).

2516021857 is a wasteful number, since it uses less digits than its factorization.

2516021857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132422222.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 2516021857 is about 50159.9626893801. The cubic root of 2516021857 is about 1360.1019706198.

The spelling of 2516021857 in words is "two billion, five hundred sixteen million, twenty-one thousand, eight hundred fifty-seven".