642640184761 has 8 divisors (see below), whose sum is σ = 676477720800. Its totient is φ = 608804085600.

The previous prime is 642640184749. The next prime is 642640184789. The reversal of 642640184761 is 167481046246.

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

It is a cyclic number.

It is not a de Polignac number, because 642640184761 - 2⁵ = 642640184729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642640134761) 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, 628485 + ... + 1296253.

It is an arithmetic number, because the mean of its divisors is an integer number (84559715100).

Almost surely, 2^642640184761 is an apocalyptic number.

It is an amenable number.

642640184761 is a deficient number, since it is larger than the sum of its proper divisors (33837536039).

642640184761 is a wasteful number, since it uses less digits than its factorization.

642640184761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718439.

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 642640184761 in words is "six hundred forty-two billion, six hundred forty million, one hundred eighty-four thousand, seven hundred sixty-one".