70645663 has 4 divisors (see below), whose sum is σ = 77068008. Its totient is φ = 64223320.

The previous prime is 70645651. The next prime is 70645709. The reversal of 70645663 is 36654607.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70645663 - 2¹³ = 70637471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70645613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3211156 + ... + 3211177.

It is an arithmetic number, because the mean of its divisors is an integer number (19267002).

Almost surely, 2^70645663 is an apocalyptic number.

70645663 is a deficient number, since it is larger than the sum of its proper divisors (6422345).

70645663 is a wasteful number, since it uses less digits than its factorization.

70645663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6422344.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 70645663 is about 8405.0974414340. The cubic root of 70645663 is about 413.3917784305.

The spelling of 70645663 in words is "seventy million, six hundred forty-five thousand, six hundred sixty-three".