647355722132074 has 4 divisors (see below), whose sum is σ = 971033583198114. Its totient is φ = 323677861066036.

The previous prime is 647355722132059. The next prime is 647355722132173. The reversal of 647355722132074 is 470231227553746.

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

It can be written as a sum of positive squares in only one way, i.e., 645580946641225 + 1774775490849 = 25408285^2 + 1332207^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161838930533017 + ... + 161838930533020.

Almost surely, 2^{647355722132074} is an apocalyptic number.

647355722132074 is a deficient number, since it is larger than the sum of its proper divisors (323677861066040).

647355722132074 is a wasteful number, since it uses less digits than its factorization.

647355722132074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323677861066039.

The product of its (nonzero) digits is 59270400, while the sum is 58.

The spelling of 647355722132074 in words is "six hundred forty-seven trillion, three hundred fifty-five billion, seven hundred twenty-two million, one hundred thirty-two thousand, seventy-four".