42451428641 has 2 divisors, whose sum is σ = 42451428642. Its totient is φ = 42451428640.

The previous prime is 42451428631. The next prime is 42451428697. The reversal of 42451428641 is 14682415424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36750423616 + 5701005025 = 191704^2 + 75505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42451428641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42451428631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21225714320 + 21225714321.

It is an arithmetic number, because the mean of its divisors is an integer number (21225714321).

Almost surely, 2^42451428641 is an apocalyptic number.

It is an amenable number.

42451428641 is a deficient number, since it is larger than the sum of its proper divisors (1).

42451428641 is an equidigital number, since it uses as much as digits as its factorization.

42451428641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 245760, while the sum is 41.

The spelling of 42451428641 in words is "forty-two billion, four hundred fifty-one million, four hundred twenty-eight thousand, six hundred forty-one".