262135042421561 has 4 divisors (see below), whose sum is σ = 263179405140624. Its totient is φ = 261090679702500.

The previous prime is 262135042421513. The next prime is 262135042421627. The reversal of 262135042421561 is 165124240531262.

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 262135042421561 - 2³⁸ = 261860164514617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (262135042421261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522181359155 + ... + 522181359656.

It is an arithmetic number, because the mean of its divisors is an integer number (65794851285156).

Almost surely, 2^{262135042421561} is an apocalyptic number.

It is an amenable number.

262135042421561 is a deficient number, since it is larger than the sum of its proper divisors (1044362719063).

262135042421561 is a wasteful number, since it uses less digits than its factorization.

262135042421561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044362719062.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 262135042421561 in words is "two hundred sixty-two trillion, one hundred thirty-five billion, forty-two million, four hundred twenty-one thousand, five hundred sixty-one".