646373730504245 has 8 divisors (see below), whose sum is σ = 775746202301784. Its totient is φ = 517033833938944.

The previous prime is 646373730504223. The next prime is 646373730504251. The reversal of 646373730504245 is 542405037373646.

It can be written as a sum of positive squares in 4 ways, for example, as 212295798499876 + 434077932004369 = 14570374^2 + 20834537^2 .

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 646373730504245 - 2¹² = 646373730500149 is a prime.

It is a Duffinian number.

It is a congruent 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, 8143764404 + ... + 8143843773.

It is an arithmetic number, because the mean of its divisors is an integer number (96968275287723).

Almost surely, 2^{646373730504245} is an apocalyptic number.

It is an amenable number.

646373730504245 is a deficient number, since it is larger than the sum of its proper divisors (129372471797539).

646373730504245 is a wasteful number, since it uses less digits than its factorization.

646373730504245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16287616119.

The product of its (nonzero) digits is 152409600, while the sum is 59.

The spelling of 646373730504245 in words is "six hundred forty-six trillion, three hundred seventy-three billion, seven hundred thirty million, five hundred four thousand, two hundred forty-five".