1642659679 has 2 divisors, whose sum is σ = 1642659680. Its totient is φ = 1642659678.

The previous prime is 1642659661. The next prime is 1642659737. The reversal of 1642659679 is 9769562461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1642659679 - 2²¹ = 1640562527 is a prime.

It is a super-4 number, since 4×1642659679⁴ (a number of 38 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642659779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821329839 + 821329840.

It is an arithmetic number, because the mean of its divisors is an integer number (821329840).

Almost surely, 2^1642659679 is an apocalyptic number.

1642659679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642659679 is an equidigital number, since it uses as much as digits as its factorization.

1642659679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 55.

The square root of 1642659679 is about 40529.7382054215. The cubic root of 1642659679 is about 1179.9108615515.

The spelling of 1642659679 in words is "one billion, six hundred forty-two million, six hundred fifty-nine thousand, six hundred seventy-nine".