640006361401 has 4 divisors (see below), whose sum is σ = 698188757904. Its totient is φ = 581823964900.

The previous prime is 640006361387. The next prime is 640006361417. The reversal of 640006361401 is 104163600046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640006361401 - 2⁵ = 640006361369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640006361471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29091198235 + ... + 29091198256.

It is an arithmetic number, because the mean of its divisors is an integer number (174547189476).

Almost surely, 2^640006361401 is an apocalyptic number.

It is an amenable number.

640006361401 is a deficient number, since it is larger than the sum of its proper divisors (58182396503).

640006361401 is a wasteful number, since it uses less digits than its factorization.

640006361401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58182396502.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 640006361401 its reverse (104163600046), we get a palindrome (744169961447).

The spelling of 640006361401 in words is "six hundred forty billion, six million, three hundred sixty-one thousand, four hundred one".