645636213516 has 192 divisors, whose sum is σ = 1775299147776. Its totient is φ = 178827264000.

The previous prime is 645636213493. The next prime is 645636213529. The reversal of 645636213516 is 615312636546.

It is a super-2 number, since 2×645636213516² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 153684216 + ... + 153688416.

It is an arithmetic number, because the mean of its divisors is an integer number (9246349728).

Almost surely, 2^645636213516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645636213516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887649573888).

645636213516 is an abundant number, since it is smaller than the sum of its proper divisors (1129662934260).

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

645636213516 is a wasteful number, since it uses less digits than its factorization.

645636213516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712 (or 4710 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 48.

The spelling of 645636213516 in words is "six hundred forty-five billion, six hundred thirty-six million, two hundred thirteen thousand, five hundred sixteen".