645082415 has 4 divisors (see below), whose sum is σ = 774098904. Its totient is φ = 516065928.

The previous prime is 645082411. The next prime is 645082421. The reversal of 645082415 is 514280546.

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 645082415 - 2² = 645082411 is a prime.

It is a super-2 number, since 2×645082415² = 832262644284464450, 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 (645082411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64508237 + ... + 64508246.

It is an arithmetic number, because the mean of its divisors is an integer number (193524726).

Almost surely, 2^645082415 is an apocalyptic number.

645082415 is a deficient number, since it is larger than the sum of its proper divisors (129016489).

645082415 is a wasteful number, since it uses less digits than its factorization.

645082415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129016488.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 645082415 is about 25398.4726903017. The cubic root of 645082415 is about 864.0490579819.

The spelling of 645082415 in words is "six hundred forty-five million, eighty-two thousand, four hundred fifteen".