2591156625849 has 27 divisors (see below), whose sum is σ = 4114051104709. Its totient is φ = 1570365760920.

The previous prime is 2591156625793. The next prime is 2591156625913. The reversal of 2591156625849 is 9485266511952.

The square root of 2591156625849 is 1609707.

It is a perfect power (a square), and thus also a powerful number.

2591156625849 is a `hidden beast` number, since 2 + 5 + 9 + 1 + 1 + 566 + 25 + 8 + 49 = 666.

It is not a de Polignac number, because 2591156625849 - 2¹¹ = 2591156623801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2591156623849) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 53095942 + ... + 53144720.

Almost surely, 2^{2591156625849} is an apocalyptic number.

2591156625849 is the 1609707-th square number.

2591156625849 is the 804854-th centered octagonal number.

It is an amenable number.

2591156625849 is a deficient number, since it is larger than the sum of its proper divisors (1522894478860).

2591156625849 is an frugal number, since it uses more digits than its factorization.

2591156625849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97586 (or 48793 counting only the distinct ones).

The product of its digits is 46656000, while the sum is 63.

The spelling of 2591156625849 in words is "two trillion, five hundred ninety-one billion, one hundred fifty-six million, six hundred twenty-five thousand, eight hundred forty-nine".