645063350077 has 4 divisors (see below), whose sum is σ = 646255704316. Its totient is φ = 643870995840.

The previous prime is 645063350059. The next prime is 645063350101. The reversal of 645063350077 is 770053360546.

645063350077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 290298974436 + 354764375641 = 538794^2 + 595621^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645063350077 is a prime.

It is a super-2 number, since 2×645063350077² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645063350777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 596176308 + ... + 596177389.

It is an arithmetic number, because the mean of its divisors is an integer number (161563926079).

Almost surely, 2^645063350077 is an apocalyptic number.

It is an amenable number.

645063350077 is a deficient number, since it is larger than the sum of its proper divisors (1192354239).

645063350077 is a wasteful number, since it uses less digits than its factorization.

645063350077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192354238.

The product of its (nonzero) digits is 1587600, while the sum is 46.

The spelling of 645063350077 in words is "six hundred forty-five billion, sixty-three million, three hundred fifty thousand, seventy-seven".