802521715645 has 12 divisors (see below), whose sum is σ = 1042803366516. Its totient is φ = 592631420160.

The previous prime is 802521715637. The next prime is 802521715651. The reversal of 802521715645 is 546517125208.

It can be written as a sum of positive squares in 6 ways, for example, as 41235800356 + 761285915289 = 203066^2 + 872517^2 .

It is not a de Polignac number, because 802521715645 - 2³ = 802521715637 is a prime.

It is a super-2 number, since 2×802521715645² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 802521715595 and 802521715604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 474864076 + ... + 474865765.

It is an arithmetic number, because the mean of its divisors is an integer number (86900280543).

Almost surely, 2^802521715645 is an apocalyptic number.

It is an amenable number.

802521715645 is a deficient number, since it is larger than the sum of its proper divisors (240281650871).

802521715645 is a wasteful number, since it uses less digits than its factorization.

802521715645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949729872 (or 949729859 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 46.

The spelling of 802521715645 in words is "eight hundred two billion, five hundred twenty-one million, seven hundred fifteen thousand, six hundred forty-five".