18750777077 has 2 divisors, whose sum is σ = 18750777078. Its totient is φ = 18750777076.

The previous prime is 18750777047. The next prime is 18750777187. The reversal of 18750777077 is 77077705781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10461402961 + 8289374116 = 102281^2 + 91046^2 .

It is a cyclic number.

It is not a de Polignac number, because 18750777077 - 2²² = 18746582773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18750777047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375388538 + 9375388539.

It is an arithmetic number, because the mean of its divisors is an integer number (9375388539).

Almost surely, 2^18750777077 is an apocalyptic number.

It is an amenable number.

18750777077 is a deficient number, since it is larger than the sum of its proper divisors (1).

18750777077 is an equidigital number, since it uses as much as digits as its factorization.

18750777077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4705960, while the sum is 56.

The spelling of 18750777077 in words is "eighteen billion, seven hundred fifty million, seven hundred seventy-seven thousand, seventy-seven".