1639772745 has 32 divisors (see below), whose sum is σ = 2916609024. Its totient is φ = 781228800.

The previous prime is 1639772731. The next prime is 1639772747. The reversal of 1639772745 is 5472779361.

It is a happy number.

1639772745 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1639772745 - 2¹² = 1639768649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1639772747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129586 + ... + 141675.

It is an arithmetic number, because the mean of its divisors is an integer number (91144032).

Almost surely, 2^1639772745 is an apocalyptic number.

1639772745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1639772745 is a deficient number, since it is larger than the sum of its proper divisors (1276836279).

1639772745 is a wasteful number, since it uses less digits than its factorization.

1639772745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271313.

The product of its digits is 2222640, while the sum is 51.

The square root of 1639772745 is about 40494.1075343068. The cubic root of 1639772745 is about 1179.2192347774.

The spelling of 1639772745 in words is "one billion, six hundred thirty-nine million, seven hundred seventy-two thousand, seven hundred forty-five".