7766721374887 has 8 divisors (see below), whose sum is σ = 7773246577152. Its totient is φ = 7760198882400.

The previous prime is 7766721374873. The next prime is 7766721374891. The reversal of 7766721374887 is 7884731276677.

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

It is a cyclic number.

It is not a de Polignac number, because 7766721374887 - 2¹⁹ = 7766720850599 is a prime.

It is a super-2 number, since 2×7766721374887² (a number of 27 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 (7766721174887) 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, 5077837 + ... + 6427897.

It is an arithmetic number, because the mean of its divisors is an integer number (971655822144).

Almost surely, 2^{7766721374887} is an apocalyptic number.

7766721374887 is a deficient number, since it is larger than the sum of its proper divisors (6525202265).

7766721374887 is a wasteful number, since it uses less digits than its factorization.

7766721374887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354889.

The product of its digits is 929359872, while the sum is 73.

The spelling of 7766721374887 in words is "seven trillion, seven hundred sixty-six billion, seven hundred twenty-one million, three hundred seventy-four thousand, eight hundred eighty-seven".