77660501 has 4 divisors (see below), whose sum is σ = 77681100. Its totient is φ = 77639904.

The previous prime is 77660491. The next prime is 77660509. The reversal of 77660501 is 10506677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10506677 = 19 ⋅552983.

It can be written as a sum of positive squares in 2 ways, for example, as 55145476 + 22515025 = 7426^2 + 4745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77660501 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 (77660509) 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, 2846 + ... + 12783.

It is an arithmetic number, because the mean of its divisors is an integer number (19420275).

Almost surely, 2^77660501 is an apocalyptic number.

It is an amenable number.

77660501 is a deficient number, since it is larger than the sum of its proper divisors (20599).

77660501 is a wasteful number, since it uses less digits than its factorization.

77660501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20598.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 77660501 is about 8812.5195602620. The cubic root of 77660501 is about 426.6450677407.

The spelling of 77660501 in words is "seventy-seven million, six hundred sixty thousand, five hundred one".