642856997937 has 16 divisors (see below), whose sum is σ = 1068645399552. Its totient is φ = 333951687120.

The previous prime is 642856997933. The next prime is 642856997953. The reversal of 642856997937 is 739799658246.

It is not a de Polignac number, because 642856997937 - 2² = 642856997933 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642856997933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1391465133 + ... + 1391465594.

It is an arithmetic number, because the mean of its divisors is an integer number (66790337472).

Almost surely, 2^642856997937 is an apocalyptic number.

It is an amenable number.

642856997937 is a deficient number, since it is larger than the sum of its proper divisors (425788401615).

642856997937 is a wasteful number, since it uses less digits than its factorization.

642856997937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782930748.

The product of its digits is 1234517760, while the sum is 75.

The spelling of 642856997937 in words is "six hundred forty-two billion, eight hundred fifty-six million, nine hundred ninety-seven thousand, nine hundred thirty-seven".