402971961689 has 4 divisors (see below), whose sum is σ = 439605776400. Its totient is φ = 366338146980.

The previous prime is 402971961677. The next prime is 402971961719. The reversal of 402971961689 is 986169179204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402971961689 - 2⁴ = 402971961673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402971961389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18316907339 + ... + 18316907360.

It is an arithmetic number, because the mean of its divisors is an integer number (109901444100).

Almost surely, 2^402971961689 is an apocalyptic number.

It is an amenable number.

402971961689 is a deficient number, since it is larger than the sum of its proper divisors (36633814711).

402971961689 is a wasteful number, since it uses less digits than its factorization.

402971961689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36633814710.

The product of its (nonzero) digits is 11757312, while the sum is 62.

The spelling of 402971961689 in words is "four hundred two billion, nine hundred seventy-one million, nine hundred sixty-one thousand, six hundred eighty-nine".