647388105137155 has 8 divisors (see below), whose sum is σ = 777576490787952. Its totient is φ = 517436641027488.

The previous prime is 647388105137149. The next prime is 647388105137173. The reversal of 647388105137155 is 551731501883746.

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

It is a cyclic number.

It is not a de Polignac number, because 647388105137155 - 2⁷ = 647388105137027 is a prime.

It is a super-2 number, since 2×647388105137155² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59230379269 + ... + 59230390198.

It is an arithmetic number, because the mean of its divisors is an integer number (97197061348494).

Almost surely, 2^{647388105137155} is an apocalyptic number.

647388105137155 is a deficient number, since it is larger than the sum of its proper divisors (130188385650797).

647388105137155 is a wasteful number, since it uses less digits than its factorization.

647388105137155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118460770565.

The product of its (nonzero) digits is 84672000, while the sum is 64.

The spelling of 647388105137155 in words is "six hundred forty-seven trillion, three hundred eighty-eight billion, one hundred five million, one hundred thirty-seven thousand, one hundred fifty-five".