645082781470 has 8 divisors (see below), whose sum is σ = 1161149006664. Its totient is φ = 258033112584.

The previous prime is 645082781449. The next prime is 645082781503. The reversal of 645082781470 is 74187280546.

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

It is a super-2 number, since 2×645082781470² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32254139064 + ... + 32254139083.

It is an arithmetic number, because the mean of its divisors is an integer number (145143625833).

Almost surely, 2^645082781470 is an apocalyptic number.

645082781470 is a deficient number, since it is larger than the sum of its proper divisors (516066225194).

645082781470 is a wasteful number, since it uses less digits than its factorization.

645082781470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64508278154.

The product of its (nonzero) digits is 3010560, while the sum is 52.

The spelling of 645082781470 in words is "six hundred forty-five billion, eighty-two million, seven hundred eighty-one thousand, four hundred seventy".