18732072577 has 4 divisors (see below), whose sum is σ = 19039155796. Its totient is φ = 18424989360.

The previous prime is 18732072563. The next prime is 18732072581. The reversal of 18732072577 is 77527023781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2948924416 + 15783148161 = 54304^2 + 125631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18732072577 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 18732072577.

It is not an unprimeable number, because it can be changed into a prime (18732072517) 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, 153541518 + ... + 153541639.

It is an arithmetic number, because the mean of its divisors is an integer number (4759788949).

Almost surely, 2^18732072577 is an apocalyptic number.

It is an amenable number.

18732072577 is a deficient number, since it is larger than the sum of its proper divisors (307083219).

18732072577 is an equidigital number, since it uses as much as digits as its factorization.

18732072577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307083218.

The product of its (nonzero) digits is 1152480, while the sum is 49.

The spelling of 18732072577 in words is "eighteen billion, seven hundred thirty-two million, seventy-two thousand, five hundred seventy-seven".