402565551541 has 4 divisors (see below), whose sum is σ = 420068401632. Its totient is φ = 385062701452.

The previous prime is 402565551491. The next prime is 402565551551. The reversal of 402565551541 is 145155565204.

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 402565551541 - 2³⁷ = 265126598069 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 (402565551551) 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, 8751425011 + ... + 8751425056.

It is an arithmetic number, because the mean of its divisors is an integer number (105017100408).

Almost surely, 2^402565551541 is an apocalyptic number.

It is an amenable number.

402565551541 is a deficient number, since it is larger than the sum of its proper divisors (17502850091).

402565551541 is a wasteful number, since it uses less digits than its factorization.

402565551541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17502850090.

The product of its (nonzero) digits is 600000, while the sum is 43.

The spelling of 402565551541 in words is "four hundred two billion, five hundred sixty-five million, five hundred fifty-one thousand, five hundred forty-one".