645269619 has 8 divisors (see below), whose sum is σ = 888113152. Its totient is φ = 416302920.

The previous prime is 645269609. The next prime is 645269671. The reversal of 645269619 is 916962546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645269619 - 2⁵ = 645269587 is a prime.

It is a super-2 number, since 2×645269619² = 832745762408810322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645269609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3469099 + ... + 3469284.

It is an arithmetic number, because the mean of its divisors is an integer number (111014144).

Almost surely, 2^645269619 is an apocalyptic number.

645269619 is a deficient number, since it is larger than the sum of its proper divisors (242843533).

645269619 is a wasteful number, since it uses less digits than its factorization.

645269619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6938417.

The product of its digits is 699840, while the sum is 48.

The square root of 645269619 is about 25402.1577626784. The cubic root of 645269619 is about 864.1326327271.

The spelling of 645269619 in words is "six hundred forty-five million, two hundred sixty-nine thousand, six hundred nineteen".