645442464116 has 6 divisors (see below), whose sum is σ = 1129524312210. Its totient is φ = 322721232056.

The previous prime is 645442464103. The next prime is 645442464169. The reversal of 645442464116 is 611464244546.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 334743244900 + 310699219216 = 578570^2 + 557404^2 .

It is a super-2 number, since 2×645442464116² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80680308011 + ... + 80680308018.

It is an arithmetic number, because the mean of its divisors is an integer number (188254052035).

Almost surely, 2^645442464116 is an apocalyptic number.

It is an amenable number.

645442464116 is a deficient number, since it is larger than the sum of its proper divisors (484081848094).

645442464116 is a wasteful number, since it uses less digits than its factorization.

645442464116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161360616033 (or 161360616031 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 47.

The spelling of 645442464116 in words is "six hundred forty-five billion, four hundred forty-two million, four hundred sixty-four thousand, one hundred sixteen".