640475167322 has 4 divisors (see below), whose sum is σ = 960712750986. Its totient is φ = 320237583660.

The previous prime is 640475167301. The next prime is 640475167337. The reversal of 640475167322 is 223761574046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 223761574046 = 2 ⋅111880787023.

It can be written as a sum of positive squares in only one way, i.e., 386832997681 + 253642169641 = 621959^2 + 503629^2 .

It is a super-2 number, since 2×640475167322² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160118791829 + ... + 160118791832.

Almost surely, 2^640475167322 is an apocalyptic number.

640475167322 is a deficient number, since it is larger than the sum of its proper divisors (320237583664).

640475167322 is a wasteful number, since it uses less digits than its factorization.

640475167322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320237583663.

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 640475167322 in words is "six hundred forty billion, four hundred seventy-five million, one hundred sixty-seven thousand, three hundred twenty-two".