42402640451 has 2 divisors, whose sum is σ = 42402640452. Its totient is φ = 42402640450.

The previous prime is 42402640421. The next prime is 42402640453. The reversal of 42402640451 is 15404620424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42402640451 - 2¹⁰ = 42402639427 is a prime.

Together with 42402640453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42402640453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21201320225 + 21201320226.

It is an arithmetic number, because the mean of its divisors is an integer number (21201320226).

Almost surely, 2^42402640451 is an apocalyptic number.

42402640451 is a deficient number, since it is larger than the sum of its proper divisors (1).

42402640451 is an equidigital number, since it uses as much as digits as its factorization.

42402640451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 32.

The spelling of 42402640451 in words is "forty-two billion, four hundred two million, six hundred forty thousand, four hundred fifty-one".