77001565 has 4 divisors (see below), whose sum is σ = 92401884. Its totient is φ = 61601248.

The previous prime is 77001553. The next prime is 77001571. The reversal of 77001565 is 56510077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56510077 = 13 ⋅4346929.

It can be written as a sum of positive squares in 2 ways, for example, as 51811204 + 25190361 = 7198^2 + 5019^2 .

It is a cyclic number.

It is not a de Polignac number, because 77001565 - 2⁷ = 77001437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7700152 + ... + 7700161.

It is an arithmetic number, because the mean of its divisors is an integer number (23100471).

Almost surely, 2^77001565 is an apocalyptic number.

It is an amenable number.

77001565 is a deficient number, since it is larger than the sum of its proper divisors (15400319).

77001565 is a wasteful number, since it uses less digits than its factorization.

77001565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15400318.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 77001565 is about 8775.0535610901. The cubic root of 77001565 is about 425.4349687483.

The spelling of 77001565 in words is "seventy-seven million, one thousand, five hundred sixty-five".