640134868435 has 16 divisors (see below), whose sum is σ = 834675010560. Its totient is φ = 469504689120.

The previous prime is 640134868433. The next prime is 640134868463. The reversal of 640134868435 is 534868431046.

It is not a de Polignac number, because 640134868435 - 2¹ = 640134868433 is a prime.

It is a super-3 number, since 3×640134868435³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (640134868433) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 108678697 + ... + 108684586.

It is an arithmetic number, because the mean of its divisors is an integer number (52167188160).

Almost surely, 2^640134868435 is an apocalyptic number.

640134868435 is a deficient number, since it is larger than the sum of its proper divisors (194540142125).

640134868435 is a wasteful number, since it uses less digits than its factorization.

640134868435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217363338.

The product of its (nonzero) digits is 6635520, while the sum is 52.

The spelling of 640134868435 in words is "six hundred forty billion, one hundred thirty-four million, eight hundred sixty-eight thousand, four hundred thirty-five".