647704067942 has 4 divisors (see below), whose sum is σ = 971556101916. Its totient is φ = 323852033970.

The previous prime is 647704067897. The next prime is 647704067993. The reversal of 647704067942 is 249760407746.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×647704067942² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161926016984 + ... + 161926016987.

It is an arithmetic number, because the mean of its divisors is an integer number (242889025479).

Almost surely, 2^647704067942 is an apocalyptic number.

647704067942 is a deficient number, since it is larger than the sum of its proper divisors (323852033974).

647704067942 is a wasteful number, since it uses less digits than its factorization.

647704067942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323852033973.

The product of its (nonzero) digits is 14224896, while the sum is 56.

The spelling of 647704067942 in words is "six hundred forty-seven billion, seven hundred four million, sixty-seven thousand, nine hundred forty-two".