659898945 has 48 divisors (see below), whose sum is σ = 1213881552. Its totient is φ = 330485760.

The previous prime is 659898931. The next prime is 659898947. The reversal of 659898945 is 549898956.

It can be written as a sum of positive squares in 8 ways, for example, as 23648769 + 636250176 = 4863^2 + 25224^2 .

It is not a de Polignac number, because 659898945 - 2⁶ = 659898881 is a prime.

It is a super-2 number, since 2×659898945² = 870933235224226050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (659898947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 498885 + ... + 500205.

It is an arithmetic number, because the mean of its divisors is an integer number (25289199).

Almost surely, 2^659898945 is an apocalyptic number.

It is an amenable number.

659898945 is a deficient number, since it is larger than the sum of its proper divisors (553982607).

659898945 is a wasteful number, since it uses less digits than its factorization.

659898945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002 (or 1999 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 63.

The square root of 659898945 is about 25688.4983017692. The cubic root of 659898945 is about 870.6143302725.

The spelling of 659898945 in words is "six hundred fifty-nine million, eight hundred ninety-eight thousand, nine hundred forty-five".