642610231061 has 4 divisors (see below), whose sum is σ = 642653586432. Its totient is φ = 642566875692.

The previous prime is 642610231051. The next prime is 642610231079. The reversal of 642610231061 is 160132016246.

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 a de Polignac number, because none of the positive numbers 2^k-642610231061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642610231051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21655445 + ... + 21685098.

It is an arithmetic number, because the mean of its divisors is an integer number (160663396608).

Almost surely, 2^642610231061 is an apocalyptic number.

It is an amenable number.

642610231061 is a deficient number, since it is larger than the sum of its proper divisors (43355371).

642610231061 is a wasteful number, since it uses less digits than its factorization.

642610231061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43355370.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 642610231061 in words is "six hundred forty-two billion, six hundred ten million, two hundred thirty-one thousand, sixty-one".