402666416389 has 4 divisors (see below), whose sum is σ = 416551465260. Its totient is φ = 388781367520.

The previous prime is 402666416363. The next prime is 402666416441. The reversal of 402666416389 is 983614666204.

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 307791944100 + 94874472289 = 554790^2 + 308017^2 .

It is a cyclic number.

It is not a de Polignac number, because 402666416389 - 2²³ = 402658027781 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 (402666426389) 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, 6942524392 + ... + 6942524449.

It is an arithmetic number, because the mean of its divisors is an integer number (104137866315).

Almost surely, 2^402666416389 is an apocalyptic number.

It is an amenable number.

402666416389 is a deficient number, since it is larger than the sum of its proper divisors (13885048871).

402666416389 is a wasteful number, since it uses less digits than its factorization.

402666416389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13885048870.

The product of its (nonzero) digits is 8957952, while the sum is 55.

The spelling of 402666416389 in words is "four hundred two billion, six hundred sixty-six million, four hundred sixteen thousand, three hundred eighty-nine".