776666689999999 has 4 divisors (see below), whose sum is σ = 777081797799840. Its totient is φ = 776251582200160.

The previous prime is 776666689999997. The next prime is 776666690000101. The reversal of 776666689999999 is 999999986666677.

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 776666689999999 - 2¹ = 776666689999997 is a prime.

It is a super-2 number, since 2×776666689999999² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 776666689999892 and 776666689999901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (776666689999997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207553897114 + ... + 207553900855.

It is an arithmetic number, because the mean of its divisors is an integer number (194270449449960).

Almost surely, 2^{776666689999999} is an apocalyptic number.

776666689999999 is a deficient number, since it is larger than the sum of its proper divisors (415107799841).

776666689999999 is a wasteful number, since it uses less digits than its factorization.

776666689999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415107799840.

The product of its digits is 14579407842048, while the sum is 115.

The spelling of 776666689999999 in words is "seven hundred seventy-six trillion, six hundred sixty-six billion, six hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".