1657994413 has 8 divisors (see below), whose sum is σ = 1671806520. Its totient is φ = 1644207360.

The previous prime is 1657994381. The next prime is 1657994431. The reversal of 1657994413 is 3144997561.

It can be written as a sum of positive squares in 4 ways, for example, as 46212804 + 1611781609 = 6798^2 + 40147^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1657994413 - 2⁵ = 1657994381 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 (1657994453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140793 + ... + 152113.

It is an arithmetic number, because the mean of its divisors is an integer number (208975815).

Almost surely, 2^1657994413 is an apocalyptic number.

It is an amenable number.

1657994413 is a deficient number, since it is larger than the sum of its proper divisors (13812107).

1657994413 is a wasteful number, since it uses less digits than its factorization.

1657994413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12527.

The product of its digits is 816480, while the sum is 49.

The square root of 1657994413 is about 40718.4775378451. The cubic root of 1657994413 is about 1183.5711056597.

The spelling of 1657994413 in words is "one billion, six hundred fifty-seven million, nine hundred ninety-four thousand, four hundred thirteen".