2157558644489 has 16 divisors (see below), whose sum is σ = 2332588054080. Its totient is φ = 1988680973760.

The previous prime is 2157558644459. The next prime is 2157558644519. The reversal of 2157558644489 is 9844468557512.

It is an interprime number because it is at equal distance from previous prime (2157558644459) and next prime (2157558644519).

It is a cyclic number.

It is not a de Polignac number, because 2157558644489 - 2⁴⁰ = 1058047016713 is a prime.

It is a super-2 number, since 2×2157558644489² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2157558644459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25218194 + ... + 25303604.

It is an arithmetic number, because the mean of its divisors is an integer number (145786753380).

Almost surely, 2^{2157558644489} is an apocalyptic number.

It is an amenable number.

2157558644489 is a deficient number, since it is larger than the sum of its proper divisors (175029409591).

2157558644489 is a wasteful number, since it uses less digits than its factorization.

2157558644489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121400.

The product of its digits is 387072000, while the sum is 68.

The spelling of 2157558644489 in words is "two trillion, one hundred fifty-seven billion, five hundred fifty-eight million, six hundred forty-four thousand, four hundred eighty-nine".