2251810161591 has 8 divisors (see below), whose sum is σ = 3002426701680. Its totient is φ = 1501200197952.

The previous prime is 2251810161577. The next prime is 2251810161599. The reversal of 2251810161591 is 1951610181522.

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

It is not a de Polignac number, because 2251810161591 - 2⁷ = 2251810161463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251810161599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780336 + ... + 2261093.

It is an arithmetic number, because the mean of its divisors is an integer number (375303337710).

Almost surely, 2^{2251810161591} is an apocalyptic number.

2251810161591 is a deficient number, since it is larger than the sum of its proper divisors (750616540089).

2251810161591 is a wasteful number, since it uses less digits than its factorization.

2251810161591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3288225.

The product of its (nonzero) digits is 43200, while the sum is 42.

The spelling of 2251810161591 in words is "two trillion, two hundred fifty-one billion, eight hundred ten million, one hundred sixty-one thousand, five hundred ninety-one".