70003661 has 16 divisors (see below), whose sum is σ = 87577728. Its totient is φ = 54475200.

The previous prime is 70003621. The next prime is 70003669. The reversal of 70003661 is 16630007.

It is not a de Polignac number, because 70003661 - 2¹⁸ = 69741517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70003669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 755 + ... + 11856.

It is an arithmetic number, because the mean of its divisors is an integer number (5473608).

Almost surely, 2^70003661 is an apocalyptic number.

It is an amenable number.

70003661 is a deficient number, since it is larger than the sum of its proper divisors (17574067).

70003661 is a wasteful number, since it uses less digits than its factorization.

70003661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12692.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 70003661 is about 8366.8190490771. The cubic root of 70003661 is about 412.1357146296.

Adding to 70003661 its reverse (16630007), we get a palindrome (86633668).

The spelling of 70003661 in words is "seventy million, three thousand, six hundred sixty-one".