4451661545 has 16 divisors (see below), whose sum is σ = 5467792512. Its totient is φ = 3478412160.

The previous prime is 4451661521. The next prime is 4451661547. The reversal of 4451661545 is 5451661544.

It is not a de Polignac number, because 4451661545 - 2⁶ = 4451661481 is a prime.

It is a super-2 number, since 2×4451661545² = 39634581022463574050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4451661547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21611 + ... + 96800.

It is an arithmetic number, because the mean of its divisors is an integer number (341737032).

Almost surely, 2^4451661545 is an apocalyptic number.

It is an amenable number.

4451661545 is a deficient number, since it is larger than the sum of its proper divisors (1016130967).

4451661545 is a wasteful number, since it uses less digits than its factorization.

4451661545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118592.

The product of its digits is 288000, while the sum is 41.

The square root of 4451661545 is about 66720.7729646472. The cubic root of 4451661545 is about 1645.0308466360.

Subtracting 4451661545 from its reverse (5451661544), we obtain a palindrome (999999999).

The spelling of 4451661545 in words is "four billion, four hundred fifty-one million, six hundred sixty-one thousand, five hundred forty-five".