2057215651 has 4 divisors (see below), whose sum is σ = 2112816112. Its totient is φ = 2001615192.

The previous prime is 2057215649. The next prime is 2057215661. The reversal of 2057215651 is 1565127502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2057215651 - 2¹ = 2057215649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2057215621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27800175 + ... + 27800248.

It is an arithmetic number, because the mean of its divisors is an integer number (528204028).

Almost surely, 2^2057215651 is an apocalyptic number.

2057215651 is a deficient number, since it is larger than the sum of its proper divisors (55600461).

2057215651 is an equidigital number, since it uses as much as digits as its factorization.

2057215651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55600460.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 2057215651 is about 45356.5392308540. The cubic root of 2057215651 is about 1271.8228007168.

The spelling of 2057215651 in words is "two billion, fifty-seven million, two hundred fifteen thousand, six hundred fifty-one".