775140661 has 4 divisors (see below), whose sum is σ = 793167232. Its totient is φ = 757114092.

The previous prime is 775140649. The next prime is 775140671. The reversal of 775140661 is 166041577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 775140661 - 2⁷ = 775140533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 775140661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775140631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9013221 + ... + 9013306.

It is an arithmetic number, because the mean of its divisors is an integer number (198291808).

Almost surely, 2^775140661 is an apocalyptic number.

It is an amenable number.

775140661 is a deficient number, since it is larger than the sum of its proper divisors (18026571).

775140661 is a wasteful number, since it uses less digits than its factorization.

775140661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18026570.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 775140661 is about 27841.3480456676. The cubic root of 775140661 is about 918.6008430419.

The spelling of 775140661 in words is "seven hundred seventy-five million, one hundred forty thousand, six hundred sixty-one".