70663591 has 2 divisors, whose sum is σ = 70663592. Its totient is φ = 70663590.

The previous prime is 70663589. The next prime is 70663631. The reversal of 70663591 is 19536607.

It is a weak prime.

It is an emirp because it is prime and its reverse (19536607) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70663591 - 2¹ = 70663589 is a prime.

Together with 70663589, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 70663591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70663561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35331795 + 35331796.

It is an arithmetic number, because the mean of its divisors is an integer number (35331796).

Almost surely, 2^70663591 is an apocalyptic number.

70663591 is a deficient number, since it is larger than the sum of its proper divisors (1).

70663591 is an equidigital number, since it uses as much as digits as its factorization.

70663591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 70663591 is about 8406.1638694472. The cubic root of 70663591 is about 413.4267447712.

The spelling of 70663591 in words is "seventy million, six hundred sixty-three thousand, five hundred ninety-one".