645211542 has 8 divisors (see below), whose sum is σ = 1290423096. Its totient is φ = 215070512.

The previous prime is 645211499. The next prime is 645211543. The reversal of 645211542 is 245112546.

645211542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

645211542 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645211543) 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, 53767623 + ... + 53767634.

It is an arithmetic number, because the mean of its divisors is an integer number (161302887).

Almost surely, 2^645211542 is an apocalyptic number.

645211542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

645211542 is a wasteful number, since it uses less digits than its factorization.

645211542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107535262.

The product of its digits is 9600, while the sum is 30.

The square root of 645211542 is about 25401.0145860357. The cubic root of 645211542 is about 864.1067067497.

It can be divided in two parts, 64 and 5211542, that added together give a triangular number (5211606 = T₃₂₂₈).

The spelling of 645211542 in words is "six hundred forty-five million, two hundred eleven thousand, five hundred forty-two".