646425260009 has 8 divisors (see below), whose sum is σ = 647742900552. Its totient is φ = 645108647040.

The previous prime is 646425259969. The next prime is 646425260011. The reversal of 646425260009 is 900062524646.

It can be written as a sum of positive squares in 4 ways, for example, as 350866675600 + 295558584409 = 592340^2 + 543653^2 .

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 646425260009 - 2¹⁶ = 646425194473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646425260609) 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, 1008887 + ... + 1520099.

It is an arithmetic number, because the mean of its divisors is an integer number (80967862569).

Almost surely, 2^646425260009 is an apocalyptic number.

It is an amenable number.

646425260009 is a deficient number, since it is larger than the sum of its proper divisors (1317640543).

646425260009 is a wasteful number, since it uses less digits than its factorization.

646425260009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513787.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 646425260009 in words is "six hundred forty-six billion, four hundred twenty-five million, two hundred sixty thousand, nine".