639721152041 has 8 divisors (see below), whose sum is σ = 649715774400. Its totient is φ = 629753876080.

The previous prime is 639721152019. The next prime is 639721152043. The reversal of 639721152041 is 140251127936.

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 639721152041 - 2¹⁴ = 639721135657 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 639721152041.

It is not an unprimeable number, because it can be changed into a prime (639721152043) 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 7 ways as a sum of consecutive naturals, for example, 6789446 + ... + 6883023.

It is an arithmetic number, because the mean of its divisors is an integer number (81214471800).

Almost surely, 2^639721152041 is an apocalyptic number.

It is an amenable number.

639721152041 is a deficient number, since it is larger than the sum of its proper divisors (9994622359).

639721152041 is a wasteful number, since it uses less digits than its factorization.

639721152041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13673199.

The product of its (nonzero) digits is 90720, while the sum is 41.

Adding to 639721152041 its reverse (140251127936), we get a palindrome (779972279977).

The spelling of 639721152041 in words is "six hundred thirty-nine billion, seven hundred twenty-one million, one hundred fifty-two thousand, forty-one".