639719206354 has 8 divisors (see below), whose sum is σ = 960024509820. Its totient is φ = 319711036416.

The previous prime is 639719206349. The next prime is 639719206433. The reversal of 639719206354 is 453602917936.

It can be written as a sum of positive squares in 2 ways, for example, as 638808555025 + 910651329 = 799255^2 + 30177^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 639719206295 and 639719206304.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74277999 + ... + 74286610.

Almost surely, 2^639719206354 is an apocalyptic number.

639719206354 is a deficient number, since it is larger than the sum of its proper divisors (320305303466).

639719206354 is a wasteful number, since it uses less digits than its factorization.

639719206354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148566764.

The product of its (nonzero) digits is 7348320, while the sum is 55.

The spelling of 639719206354 in words is "six hundred thirty-nine billion, seven hundred nineteen million, two hundred six thousand, three hundred fifty-four".