5161380266591 has 4 divisors (see below), whose sum is σ = 5190214793400. Its totient is φ = 5132545739784.

The previous prime is 5161380266507. The next prime is 5161380266687. The reversal of 5161380266591 is 1956620831615.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5161380266591 - 2⁴² = 763333755487 is a prime.

It is a super-2 number, since 2×5161380266591² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5161380266501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14417263136 + ... + 14417263493.

It is an arithmetic number, because the mean of its divisors is an integer number (1297553698350).

Almost surely, 2^{5161380266591} is an apocalyptic number.

5161380266591 is a deficient number, since it is larger than the sum of its proper divisors (28834526809).

5161380266591 is a wasteful number, since it uses less digits than its factorization.

5161380266591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28834526808.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The spelling of 5161380266591 in words is "five trillion, one hundred sixty-one billion, three hundred eighty million, two hundred sixty-six thousand, five hundred ninety-one".