645061445 has 8 divisors (see below), whose sum is σ = 884655744. Its totient is φ = 442327824.

The previous prime is 645061433. The next prime is 645061451. The reversal of 645061445 is 544160546.

645061445 is digitally balanced in base 6, 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 cyclic number.

It is not a de Polignac number, because 645061445 - 2¹² = 645057349 is a prime.

It is a super-2 number, since 2×645061445² = 832208535650976050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 18430327 = 645061445 / (6 + 4 + 5 + 0 + 6 + 1 + 4 + 4 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9215129 + ... + 9215198.

It is an arithmetic number, because the mean of its divisors is an integer number (110581968).

Almost surely, 2^645061445 is an apocalyptic number.

It is an amenable number.

645061445 is a deficient number, since it is larger than the sum of its proper divisors (239594299).

645061445 is a wasteful number, since it uses less digits than its factorization.

645061445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18430339.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 645061445 is about 25398.0598668481. The cubic root of 645061445 is about 864.0396951963.

The spelling of 645061445 in words is "six hundred forty-five million, sixty-one thousand, four hundred forty-five".