645713033444 has 6 divisors (see below), whose sum is σ = 1129997808534. Its totient is φ = 322856516720.

The previous prime is 645713033363. The next prime is 645713033551. The reversal of 645713033444 is 444330317546.

It can be written as a sum of positive squares in only one way, i.e., 385243662400 + 260469371044 = 620680^2 + 510362^2 .

It is a super-2 number, since 2×645713033444² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645713033395 and 645713033404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80714129177 + ... + 80714129184.

It is an arithmetic number, because the mean of its divisors is an integer number (188332968089).

Almost surely, 2^645713033444 is an apocalyptic number.

It is an amenable number.

645713033444 is a deficient number, since it is larger than the sum of its proper divisors (484284775090).

645713033444 is a wasteful number, since it uses less digits than its factorization.

645713033444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161428258365 (or 161428258363 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 44.

The spelling of 645713033444 in words is "six hundred forty-five billion, seven hundred thirteen million, thirty-three thousand, four hundred forty-four".