640462652526 has 64 divisors (see below), whose sum is σ = 1375355661120. Its totient is φ = 198117949440.

The previous prime is 640462652447. The next prime is 640462652527. The reversal of 640462652526 is 625256264046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640462652527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2541166 + ... + 2781806.

It is an arithmetic number, because the mean of its divisors is an integer number (21489932205).

Almost surely, 2^640462652526 is an apocalyptic number.

640462652526 is an abundant number, since it is smaller than the sum of its proper divisors (734893008594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640462652526 is a wasteful number, since it uses less digits than its factorization.

640462652526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241029.

The product of its (nonzero) digits is 4147200, while the sum is 48.

The spelling of 640462652526 in words is "six hundred forty billion, four hundred sixty-two million, six hundred fifty-two thousand, five hundred twenty-six".