1636145077 has 4 divisors (see below), whose sum is σ = 1869880096. Its totient is φ = 1402410060.

The previous prime is 1636145047. The next prime is 1636145083. The reversal of 1636145077 is 7705416361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1636145077 - 2²³ = 1627756469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636145047) 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, 116867499 + ... + 116867512.

It is an arithmetic number, because the mean of its divisors is an integer number (467470024).

Almost surely, 2^1636145077 is an apocalyptic number.

It is an amenable number.

1636145077 is a deficient number, since it is larger than the sum of its proper divisors (233735019).

1636145077 is an equidigital number, since it uses as much as digits as its factorization.

1636145077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233735018.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 1636145077 is about 40449.2901915472. The cubic root of 1636145077 is about 1178.3489974468.

The spelling of 1636145077 in words is "one billion, six hundred thirty-six million, one hundred forty-five thousand, seventy-seven".