645695119 has 4 divisors (see below), whose sum is σ = 645832080. Its totient is φ = 645558160.

The previous prime is 645695117. The next prime is 645695137. The reversal of 645695119 is 911596546.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 645695119 - 2¹ = 645695117 is a prime.

It is a super-2 number, since 2×645695119² = 833844373400848322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645695117) 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, 61147 + ... + 70924.

It is an arithmetic number, because the mean of its divisors is an integer number (161458020).

Almost surely, 2^645695119 is an apocalyptic number.

645695119 is a deficient number, since it is larger than the sum of its proper divisors (136961).

645695119 is a wasteful number, since it uses less digits than its factorization.

645695119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136960.

The product of its digits is 291600, while the sum is 46.

The square root of 645695119 is about 25410.5316552015. The cubic root of 645695119 is about 864.3225314579.

The spelling of 645695119 in words is "six hundred forty-five million, six hundred ninety-five thousand, one hundred nineteen".