76665261506565 has 32 divisors (see below), whose sum is σ = 123406663919616. Its totient is φ = 40640754969920.

The previous prime is 76665261506543. The next prime is 76665261506627. The reversal of 76665261506565 is 56560516256667.

It is not a de Polignac number, because 76665261506565 - 2⁶ = 76665261506501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 76665261506496 and 76665261506505.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 39387730 + ... + 41288300.

It is an arithmetic number, because the mean of its divisors is an integer number (3856458247488).

Almost surely, 2^{76665261506565} is an apocalyptic number.

It is an amenable number.

76665261506565 is a deficient number, since it is larger than the sum of its proper divisors (46741402413051).

76665261506565 is a wasteful number, since it uses less digits than its factorization.

76665261506565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916849.

The product of its (nonzero) digits is 408240000, while the sum is 66.

The spelling of 76665261506565 in words is "seventy-six trillion, six hundred sixty-five billion, two hundred sixty-one million, five hundred six thousand, five hundred sixty-five".