647373681242 has 8 divisors (see below), whose sum is σ = 971474274336. Its totient is φ = 323548923132.

The previous prime is 647373681211. The next prime is 647373681271. The reversal of 647373681242 is 242186373746.

It is a happy number.

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

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, 68952878 + ... + 68962265.

It is an arithmetic number, because the mean of its divisors is an integer number (121434284292).

Almost surely, 2^647373681242 is an apocalyptic number.

647373681242 is a deficient number, since it is larger than the sum of its proper divisors (324100593094).

647373681242 is a wasteful number, since it uses less digits than its factorization.

647373681242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137917492.

The product of its digits is 8128512, while the sum is 53.

The spelling of 647373681242 in words is "six hundred forty-seven billion, three hundred seventy-three million, six hundred eighty-one thousand, two hundred forty-two".