2537991865 has 8 divisors (see below), whose sum is σ = 3072543048. Its totient is φ = 2012424960.

The previous prime is 2537991857. The next prime is 2537991893. The reversal of 2537991865 is 5681997352.

It can be written as a sum of positive squares in 4 ways, for example, as 110754576 + 2427237289 = 10524^2 + 49267^2 .

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

It is not a de Polignac number, because 2537991865 - 2³ = 2537991857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2245446 + ... + 2246575.

It is an arithmetic number, because the mean of its divisors is an integer number (384067881).

Almost surely, 2^2537991865 is an apocalyptic number.

It is an amenable number.

2537991865 is a deficient number, since it is larger than the sum of its proper divisors (534551183).

2537991865 is a wasteful number, since it uses less digits than its factorization.

2537991865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4492139.

The product of its digits is 4082400, while the sum is 55.

The square root of 2537991865 is about 50378.4861324752. The cubic root of 2537991865 is about 1364.0493257432.

The spelling of 2537991865 in words is "two billion, five hundred thirty-seven million, nine hundred ninety-one thousand, eight hundred sixty-five".