640126241655 has 32 divisors (see below), whose sum is σ = 1027441324800. Its totient is φ = 340321830912.

The previous prime is 640126241611. The next prime is 640126241717. The reversal of 640126241655 is 556142621046.

It is not a de Polignac number, because 640126241655 - 2⁷ = 640126241527 is a prime.

It is a congruent number.

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, 11222167 + ... + 11279063.

It is an arithmetic number, because the mean of its divisors is an integer number (32107541400).

Almost surely, 2^640126241655 is an apocalyptic number.

640126241655 is a deficient number, since it is larger than the sum of its proper divisors (387315083145).

640126241655 is a wasteful number, since it uses less digits than its factorization.

640126241655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59263.

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 640126241655 in words is "six hundred forty billion, one hundred twenty-six million, two hundred forty-one thousand, six hundred fifty-five".