644602536146011 has 8 divisors (see below), whose sum is σ = 690743468926224. Its totient is φ = 599375285203200.

The previous prime is 644602536145991. The next prime is 644602536146077. The reversal of 644602536146011 is 110641635206446.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644602536146011 is a prime.

It is a super-2 number, since 2×644602536146011² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644602536146081) 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, 228420457890 + ... + 228420460711.

It is an arithmetic number, because the mean of its divisors is an integer number (86342933615778).

Almost surely, 2^{644602536146011} is an apocalyptic number.

644602536146011 is a deficient number, since it is larger than the sum of its proper divisors (46140932780213).

644602536146011 is a wasteful number, since it uses less digits than its factorization.

644602536146011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456840918701.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 644602536146011 in words is "six hundred forty-four trillion, six hundred two billion, five hundred thirty-six million, one hundred forty-six thousand, eleven".