639726954477 has 8 divisors (see below), whose sum is σ = 918582293664. Its totient is φ = 393678125808.

The previous prime is 639726954467. The next prime is 639726954487. The reversal of 639726954477 is 774459627936.

It is an interprime number because it is at equal distance from previous prime (639726954467) and next prime (639726954487).

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

It is not a de Polignac number, because 639726954477 - 2¹² = 639726950381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639726954467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8201627583 + ... + 8201627660.

It is an arithmetic number, because the mean of its divisors is an integer number (114822786708).

Almost surely, 2^639726954477 is an apocalyptic number.

It is an amenable number.

639726954477 is a deficient number, since it is larger than the sum of its proper divisors (278855339187).

639726954477 is a wasteful number, since it uses less digits than its factorization.

639726954477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16403255259.

The product of its digits is 480090240, while the sum is 69.

The spelling of 639726954477 in words is "six hundred thirty-nine billion, seven hundred twenty-six million, nine hundred fifty-four thousand, four hundred seventy-seven".