645141619 has 4 divisors (see below), whose sum is σ = 683091144. Its totient is φ = 607192096.

The previous prime is 645141617. The next prime is 645141659. The reversal of 645141619 is 916141546.

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 645141619 - 2¹ = 645141617 is a prime.

It is a super-2 number, since 2×645141619² = 832415417131882322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645141617) 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, 18974737 + ... + 18974770.

It is an arithmetic number, because the mean of its divisors is an integer number (170772786).

Almost surely, 2^645141619 is an apocalyptic number.

645141619 is a deficient number, since it is larger than the sum of its proper divisors (37949525).

645141619 is a wasteful number, since it uses less digits than its factorization.

645141619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37949524.

The product of its digits is 25920, while the sum is 37.

The square root of 645141619 is about 25399.6381667141. The cubic root of 645141619 is about 864.0754905712.

The spelling of 645141619 in words is "six hundred forty-five million, one hundred forty-one thousand, six hundred nineteen".