642533532121505 has 32 divisors (see below), whose sum is σ = 797882948000640. Its totient is φ = 496143041909760.

The previous prime is 642533532121489. The next prime is 642533532121531. The reversal of 642533532121505 is 505121235335246.

It is a happy number.

It is not a de Polignac number, because 642533532121505 - 2⁴ = 642533532121489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642533532121505.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 12321555842 + ... + 12321607988.

It is an arithmetic number, because the mean of its divisors is an integer number (24933842125020).

Almost surely, 2^{642533532121505} is an apocalyptic number.

It is an amenable number.

642533532121505 is a deficient number, since it is larger than the sum of its proper divisors (155349415879135).

642533532121505 is a wasteful number, since it uses less digits than its factorization.

642533532121505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77729.

The product of its (nonzero) digits is 3240000, while the sum is 47.

The spelling of 642533532121505 in words is "six hundred forty-two trillion, five hundred thirty-three billion, five hundred thirty-two million, one hundred twenty-one thousand, five hundred five".