645115452740 has 48 divisors (see below), whose sum is σ = 1478820188160. Its totient is φ = 234441511680.

The previous prime is 645115452733. The next prime is 645115452871. The reversal of 645115452740 is 47254511546.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 645115452691 and 645115452700.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557252 + ... + 1265211.

It is an arithmetic number, because the mean of its divisors is an integer number (30808753920).

Almost surely, 2^645115452740 is an apocalyptic number.

It is an amenable number.

645115452740 is an abundant number, since it is smaller than the sum of its proper divisors (833704735420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645115452740 is a wasteful number, since it uses less digits than its factorization.

645115452740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824092 (or 1824090 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 44.

The spelling of 645115452740 in words is "six hundred forty-five billion, one hundred fifteen million, four hundred fifty-two thousand, seven hundred forty".