70565861 has 4 divisors (see below), whose sum is σ = 74716812. Its totient is φ = 66414912.

The previous prime is 70565839. The next prime is 70565939. The reversal of 70565861 is 16856507.

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: 16856507 = 2963 ⋅5689.

It can be written as a sum of positive squares in 2 ways, for example, as 21215236 + 49350625 = 4606^2 + 7025^2 .

It is a cyclic number.

It is not a de Polignac number, because 70565861 - 2¹⁴ = 70549477 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 (70565821) 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, 2075450 + ... + 2075483.

It is an arithmetic number, because the mean of its divisors is an integer number (18679203).

Almost surely, 2^70565861 is an apocalyptic number.

It is an amenable number.

70565861 is a deficient number, since it is larger than the sum of its proper divisors (4150951).

70565861 is a wasteful number, since it uses less digits than its factorization.

70565861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150950.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 70565861 is about 8400.3488618033. The cubic root of 70565861 is about 413.2360627133.

It can be divided in two parts, 705 and 65861, that added together give a palindrome (66566).

The spelling of 70565861 in words is "seventy million, five hundred sixty-five thousand, eight hundred sixty-one".