1642505867 has 2 divisors, whose sum is σ = 1642505868. Its totient is φ = 1642505866.

The previous prime is 1642505861. The next prime is 1642505933. The reversal of 1642505867 is 7685052461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1642505867 - 2⁶ = 1642505803 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642505861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821252933 + 821252934.

It is an arithmetic number, because the mean of its divisors is an integer number (821252934).

Almost surely, 2^1642505867 is an apocalyptic number.

1642505867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642505867 is an equidigital number, since it uses as much as digits as its factorization.

1642505867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 1642505867 is about 40527.8406407250. The cubic root of 1642505867 is about 1179.8740330438.

The spelling of 1642505867 in words is "one billion, six hundred forty-two million, five hundred five thousand, eight hundred sixty-seven".