640548723401361 has 40 divisors (see below), whose sum is σ = 989474307427584. Its totient is φ = 412721903262240.

The previous prime is 640548723401333. The next prime is 640548723401369. The reversal of 640548723401361 is 163104327845046.

640548723401361 is a `hidden beast` number, since 6 + 4 + 0 + 5 + 48 + 7 + 234 + 0 + 1 + 361 = 666.

It is not a de Polignac number, because 640548723401361 - 2⁶ = 640548723401297 is a prime.

It is a super-2 number, since 2×640548723401361² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640548723401298 and 640548723401307.

It is not an unprimeable number, because it can be changed into a prime (640548723401369) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1113202785 + ... + 1113778046.

Almost surely, 2^{640548723401361} is an apocalyptic number.

It is an amenable number.

640548723401361 is a deficient number, since it is larger than the sum of its proper divisors (348925584026223).

640548723401361 is a wasteful number, since it uses less digits than its factorization.

640548723401361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226980963 (or 2226980954 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

The spelling of 640548723401361 in words is "six hundred forty trillion, five hundred forty-eight billion, seven hundred twenty-three million, four hundred one thousand, three hundred sixty-one".