774923919721 has 16 divisors (see below), whose sum is σ = 932351016960. Its totient is φ = 629186121360.

The previous prime is 774923919701. The next prime is 774923919773. The reversal of 774923919721 is 127919329477.

It is a cyclic number.

It is not a de Polignac number, because 774923919721 - 2¹¹ = 774923917673 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 774923919721.

It is not an unprimeable number, because it can be changed into a prime (774923919701) 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 15 ways as a sum of consecutive naturals, for example, 778566 + ... + 1468336.

It is an arithmetic number, because the mean of its divisors is an integer number (58271938560).

Almost surely, 2^774923919721 is an apocalyptic number.

It is an amenable number.

774923919721 is a deficient number, since it is larger than the sum of its proper divisors (157427097239).

774923919721 is a wasteful number, since it uses less digits than its factorization.

774923919721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698244.

The product of its digits is 12002256, while the sum is 61.

The spelling of 774923919721 in words is "seven hundred seventy-four billion, nine hundred twenty-three million, nine hundred nineteen thousand, seven hundred twenty-one".