640154226535 has 8 divisors (see below), whose sum is σ = 774049080816. Its totient is φ = 508214041920.

The previous prime is 640154226521. The next prime is 640154226553. The reversal of 640154226535 is 535622451046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640154226535 - 2¹⁹ = 640153702247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640154226491 and 640154226500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488666694 + ... + 488668003.

It is an arithmetic number, because the mean of its divisors is an integer number (96756135102).

Almost surely, 2^640154226535 is an apocalyptic number.

640154226535 is a deficient number, since it is larger than the sum of its proper divisors (133894854281).

640154226535 is a wasteful number, since it uses less digits than its factorization.

640154226535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977334833.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 640154226535 in words is "six hundred forty billion, one hundred fifty-four million, two hundred twenty-six thousand, five hundred thirty-five".