640620126563 has 8 divisors (see below), whose sum is σ = 690036827136. Its totient is φ = 593000397000.

The previous prime is 640620126541. The next prime is 640620126577. The reversal of 640620126563 is 365621026046.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 640620126563 - 2³⁴ = 623440257379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640620126563.

It is not an unprimeable number, because it can be changed into a prime (640620126583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449242013 + ... + 449243438.

It is an arithmetic number, because the mean of its divisors is an integer number (86254603392).

Almost surely, 2^640620126563 is an apocalyptic number.

640620126563 is a deficient number, since it is larger than the sum of its proper divisors (49416700573).

640620126563 is a wasteful number, since it uses less digits than its factorization.

640620126563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898485505.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 640620126563 in words is "six hundred forty billion, six hundred twenty million, one hundred twenty-six thousand, five hundred sixty-three".