70635661 has 4 divisors (see below), whose sum is σ = 72358524. Its totient is φ = 68912800.

The previous prime is 70635641. The next prime is 70635671. The reversal of 70635661 is 16653607.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16653607 = 53 ⋅314219.

It can be written as a sum of positive squares in 2 ways, for example, as 31573161 + 39062500 = 5619^2 + 6250^2 .

It is not a de Polignac number, because 70635661 - 2⁷ = 70635533 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 (70635641) 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, 861370 + ... + 861451.

It is an arithmetic number, because the mean of its divisors is an integer number (18089631).

Almost surely, 2^70635661 is an apocalyptic number.

It is an amenable number.

70635661 is a deficient number, since it is larger than the sum of its proper divisors (1722863).

70635661 is a wasteful number, since it uses less digits than its factorization.

70635661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722862.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 70635661 is about 8404.5024242962. The cubic root of 70635661 is about 413.3722681990.

The spelling of 70635661 in words is "seventy million, six hundred thirty-five thousand, six hundred sixty-one".