645155542 has 8 divisors (see below), whose sum is σ = 1024658856. Its totient is φ = 303602592.

The previous prime is 645155527. The next prime is 645155549. The reversal of 645155542 is 245551546.

645155542 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.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645155549) 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, 9487548 + ... + 9487615.

It is an arithmetic number, because the mean of its divisors is an integer number (128082357).

Almost surely, 2^645155542 is an apocalyptic number.

645155542 is a deficient number, since it is larger than the sum of its proper divisors (379503314).

645155542 is a wasteful number, since it uses less digits than its factorization.

645155542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18975182.

The product of its digits is 120000, while the sum is 37.

The square root of 645155542 is about 25399.9122439429. The cubic root of 645155542 is about 864.0817064862.

The spelling of 645155542 in words is "six hundred forty-five million, one hundred fifty-five thousand, five hundred forty-two".