77280072661 has 8 divisors (see below), whose sum is σ = 86361766848. Its totient is φ = 68541084000.

The previous prime is 77280072637. The next prime is 77280072671. The reversal of 77280072661 is 16627008277.

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 77280072661 - 2⁵ = 77280072629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77280072671) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 85675905 + ... + 85676806.

It is an arithmetic number, because the mean of its divisors is an integer number (10795220856).

Almost surely, 2^77280072661 is an apocalyptic number.

It is an amenable number.

77280072661 is a deficient number, since it is larger than the sum of its proper divisors (9081694187).

77280072661 is a wasteful number, since it uses less digits than its factorization.

77280072661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171352763.

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 77280072661 in words is "seventy-seven billion, two hundred eighty million, seventy-two thousand, six hundred sixty-one".