775550551 has 4 divisors (see below), whose sum is σ = 783080272. Its totient is φ = 768020832.

The previous prime is 775550549. The next prime is 775550563. The reversal of 775550551 is 155055577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155055577 = 73 ⋅2124049.

It is a cyclic number.

It is not a de Polignac number, because 775550551 - 2¹ = 775550549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775550521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3764706 + ... + 3764911.

It is an arithmetic number, because the mean of its divisors is an integer number (195770068).

Almost surely, 2^775550551 is an apocalyptic number.

775550551 is a deficient number, since it is larger than the sum of its proper divisors (7529721).

775550551 is a wasteful number, since it uses less digits than its factorization.

775550551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7529720.

The product of its (nonzero) digits is 153125, while the sum is 40.

The square root of 775550551 is about 27848.7082465238. The cubic root of 775550551 is about 918.7627314878.

The spelling of 775550551 in words is "seven hundred seventy-five million, five hundred fifty thousand, five hundred fifty-one".