2057645749 has 4 divisors (see below), whose sum is σ = 2058912064. Its totient is φ = 2056379436.

The previous prime is 2057645701. The next prime is 2057645767. The reversal of 2057645749 is 9475467502.

It is a happy number.

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 2057645749 - 2⁷ = 2057645621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2057645549) 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, 630717 + ... + 633970.

It is an arithmetic number, because the mean of its divisors is an integer number (514728016).

Almost surely, 2^2057645749 is an apocalyptic number.

It is an amenable number.

2057645749 is a deficient number, since it is larger than the sum of its proper divisors (1266315).

2057645749 is a wasteful number, since it uses less digits than its factorization.

2057645749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266314.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The square root of 2057645749 is about 45361.2802839602. The cubic root of 2057645749 is about 1271.9114270317.

The spelling of 2057645749 in words is "two billion, fifty-seven million, six hundred forty-five thousand, seven hundred forty-nine".