1797957557 has 4 divisors (see below), whose sum is σ = 1961408256. Its totient is φ = 1634506860.

The previous prime is 1797957467. The next prime is 1797957607. The reversal of 1797957557 is 7557597971.

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 1797957557 - 2¹² = 1797953461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1797957557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1797917557) 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, 81725333 + ... + 81725354.

It is an arithmetic number, because the mean of its divisors is an integer number (490352064).

Almost surely, 2^1797957557 is an apocalyptic number.

It is an amenable number.

1797957557 is a deficient number, since it is larger than the sum of its proper divisors (163450699).

1797957557 is a wasteful number, since it uses less digits than its factorization.

1797957557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163450698.

The product of its digits is 24310125, while the sum is 62.

The square root of 1797957557 is about 42402.3296176047. The cubic root of 1797957557 is about 1215.9801305059.

The spelling of 1797957557 in words is "one billion, seven hundred ninety-seven million, nine hundred fifty-seven thousand, five hundred fifty-seven".