646267075553245 has 96 divisors (see below), whose sum is σ = 835625405190240. Its totient is φ = 479555018342400.

The previous prime is 646267075553243. The next prime is 646267075553249. The reversal of 646267075553245 is 542355570762646.

It can be written as a sum of positive squares in 16 ways, for example, as 181129257314329 + 465137818238916 = 13458427^2 + 21567054^2 .

It is not a de Polignac number, because 646267075553245 - 2¹ = 646267075553243 is a prime.

It is a super-2 number, since 2×646267075553245² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646267075553243) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 34946569219 + ... + 34946587711.

It is an arithmetic number, because the mean of its divisors is an integer number (8704431304065).

Almost surely, 2^{646267075553245} is an apocalyptic number.

It is an amenable number.

646267075553245 is a deficient number, since it is larger than the sum of its proper divisors (189358329636995).

646267075553245 is a wasteful number, since it uses less digits than its factorization.

646267075553245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21487 (or 21464 counting only the distinct ones).

The product of its (nonzero) digits is 1270080000, while the sum is 67.

The spelling of 646267075553245 in words is "six hundred forty-six trillion, two hundred sixty-seven billion, seventy-five million, five hundred fifty-three thousand, two hundred forty-five".