645361521030 has 48 divisors (see below), whose sum is σ = 1694553245424. Its totient is φ = 170392478400.

The previous prime is 645361521019. The next prime is 645361521031. The reversal of 645361521030 is 30125163546.

645361521030 is a `hidden beast` number, since 6 + 4 + 5 + 3 + 615 + 2 + 1 + 0 + 30 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645361521031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35489344 + ... + 35507523.

It is an arithmetic number, because the mean of its divisors is an integer number (35303192613).

Almost surely, 2^645361521030 is an apocalyptic number.

645361521030 is an abundant number, since it is smaller than the sum of its proper divisors (1049191724394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645361521030 is a wasteful number, since it uses less digits than its factorization.

645361521030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70996981 (or 70996978 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 645361521030 its reverse (30125163546), we get a palindrome (675486684576).

The spelling of 645361521030 in words is "six hundred forty-five billion, three hundred sixty-one million, five hundred twenty-one thousand, thirty".