77352661 has 4 divisors (see below), whose sum is σ = 77395500. Its totient is φ = 77309824.

The previous prime is 77352643. The next prime is 77352677. The reversal of 77352661 is 16625377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16625377 = 41 ⋅405497.

It can be written as a sum of positive squares in 2 ways, for example, as 36072036 + 41280625 = 6006^2 + 6425^2 .

It is a cyclic number.

It is not a de Polignac number, because 77352661 - 2¹⁹ = 76828373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77352661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77350661) 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, 18586 + ... + 22363.

It is an arithmetic number, because the mean of its divisors is an integer number (19348875).

Almost surely, 2^77352661 is an apocalyptic number.

It is an amenable number.

77352661 is a deficient number, since it is larger than the sum of its proper divisors (42839).

77352661 is a wasteful number, since it uses less digits than its factorization.

77352661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42838.

The product of its digits is 52920, while the sum is 37.

The square root of 77352661 is about 8795.0361568330. The cubic root of 77352661 is about 426.0805922890.

The spelling of 77352661 in words is "seventy-seven million, three hundred fifty-two thousand, six hundred sixty-one".