2158897656 has 16 divisors (see below), whose sum is σ = 5397244200. Its totient is φ = 719632544.

The previous prime is 2158897633. The next prime is 2158897679. The reversal of 2158897656 is 6567988512.

It is an interprime number because it is at equal distance from previous prime (2158897633) and next prime (2158897679).

It is a junction number, because it is equal to n+sod(n) for n = 2158897596 and 2158897605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44977011 + ... + 44977058.

Almost surely, 2^2158897656 is an apocalyptic number.

It is an amenable number.

2158897656 is an abundant number, since it is smaller than the sum of its proper divisors (3238346544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2158897656 is a wasteful number, since it uses less digits than its factorization.

2158897656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89954078 (or 89954074 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 57.

The square root of 2158897656 is about 46463.9393078116. The cubic root of 2158897656 is about 1292.4408758451.

It can be divided in two parts, 215 and 8897656, that added together give a triangular number (8897871 = T₄₂₁₈).

The spelling of 2158897656 in words is "two billion, one hundred fifty-eight million, eight hundred ninety-seven thousand, six hundred fifty-six".