640261106061 has 8 divisors (see below), whose sum is σ = 853955015424. Its totient is φ = 426703967040.

The previous prime is 640261106057. The next prime is 640261106063. The reversal of 640261106061 is 160601162046.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640261106061 - 2² = 640261106057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640261106063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34181661 + ... + 34200386.

It is an arithmetic number, because the mean of its divisors is an integer number (106744376928).

Almost surely, 2^640261106061 is an apocalyptic number.

It is an amenable number.

640261106061 is a deficient number, since it is larger than the sum of its proper divisors (213693909363).

640261106061 is a wasteful number, since it uses less digits than its factorization.

640261106061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68385171.

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 640261106061 in words is "six hundred forty billion, two hundred sixty-one million, one hundred six thousand, sixty-one".