866145029 has 4 divisors (see below), whose sum is σ = 866640876. Its totient is φ = 865649184.

The previous prime is 866145023. The next prime is 866145031. The reversal of 866145029 is 920541668.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 403809025 + 462336004 = 20095^2 + 21502^2 .

It is a cyclic number.

It is not a de Polignac number, because 866145029 - 2¹⁶ = 866079493 is a prime.

It is a super-2 number, since 2×866145029² = 1500414422522821682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866145023) 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, 245294 + ... + 248799.

It is an arithmetic number, because the mean of its divisors is an integer number (216660219).

Almost surely, 2^866145029 is an apocalyptic number.

It is an amenable number.

866145029 is a deficient number, since it is larger than the sum of its proper divisors (495847).

866145029 is a wasteful number, since it uses less digits than its factorization.

866145029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495846.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 866145029 is about 29430.3419789849. The cubic root of 866145029 is about 953.2281791717.

The spelling of 866145029 in words is "eight hundred sixty-six million, one hundred forty-five thousand, twenty-nine".