661260536 has 16 divisors (see below), whose sum is σ = 1268698200. Its totient is φ = 322941024.

The previous prime is 661260533. The next prime is 661260541. The reversal of 661260536 is 635062166.

It is a junction number, because it is equal to n+sod(n) for n = 661260496 and 661260505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661260533) 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, 960791 + ... + 961478.

Almost surely, 2^661260536 is an apocalyptic number.

It is an amenable number.

661260536 is a deficient number, since it is larger than the sum of its proper divisors (607437664).

661260536 is a wasteful number, since it uses less digits than its factorization.

661260536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922318 (or 1922314 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 661260536 is about 25714.9866031464. The cubic root of 661260536 is about 871.2127078843.

The spelling of 661260536 in words is "six hundred sixty-one million, two hundred sixty thousand, five hundred thirty-six".