645233053693 has 2 divisors, whose sum is σ = 645233053694. Its totient is φ = 645233053692.

The previous prime is 645233053651. The next prime is 645233053709. The reversal of 645233053693 is 396350332546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 480224052324 + 165009001369 = 692982^2 + 406213^2 .

It is a cyclic number.

It is not a de Polignac number, because 645233053693 - 2³⁷ = 507794100221 is a prime.

It is a super-3 number, since 3×645233053693³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645233053793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322616526846 + 322616526847.

It is an arithmetic number, because the mean of its divisors is an integer number (322616526847).

Almost surely, 2^645233053693 is an apocalyptic number.

It is an amenable number.

645233053693 is a deficient number, since it is larger than the sum of its proper divisors (1).

645233053693 is an equidigital number, since it uses as much as digits as its factorization.

645233053693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5248800, while the sum is 49.

The spelling of 645233053693 in words is "six hundred forty-five billion, two hundred thirty-three million, fifty-three thousand, six hundred ninety-three".