642330877 has 2 divisors, whose sum is σ = 642330878. Its totient is φ = 642330876.

The previous prime is 642330781. The next prime is 642330883. The reversal of 642330877 is 778033246.

It is a happy number.

642330877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574992441 + 67338436 = 23979^2 + 8206^2 .

It is a cyclic number.

It is not a de Polignac number, because 642330877 - 2⁷ = 642330749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642330977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321165438 + 321165439.

It is an arithmetic number, because the mean of its divisors is an integer number (321165439).

Almost surely, 2^642330877 is an apocalyptic number.

It is an amenable number.

642330877 is a deficient number, since it is larger than the sum of its proper divisors (1).

642330877 is an equidigital number, since it uses as much as digits as its factorization.

642330877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 642330877 is about 25344.2474143542. The cubic root of 642330877 is about 862.8188006396.

The spelling of 642330877 in words is "six hundred forty-two million, three hundred thirty thousand, eight hundred seventy-seven".