640061831026 has 32 divisors (see below), whose sum is σ = 1014679042560. Its totient is φ = 302193475584.

The previous prime is 640061831021. The next prime is 640061831039. The reversal of 640061831026 is 620138160046.

It is a happy number.

It is a pancake number, because a pancake can be divided into 640061831026 parts by 1131425 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (640061831021) 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, 34415586 + ... + 34434178.

It is an arithmetic number, because the mean of its divisors is an integer number (31708720080).

Almost surely, 2^640061831026 is an apocalyptic number.

640061831026 is the 427639-th nonagonal number.

640061831026 is a deficient number, since it is larger than the sum of its proper divisors (374617211534).

640061831026 is a wasteful number, since it uses less digits than its factorization.

640061831026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28170.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 640061831026 in words is "six hundred forty billion, sixty-one million, eight hundred thirty-one thousand, twenty-six".