661101530 has 32 divisors (see below), whose sum is σ = 1235278080. Its totient is φ = 254560320.

The previous prime is 661101517. The next prime is 661101541. The reversal of 661101530 is 35101166.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 661101496 and 661101505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17141 + ... + 40199.

It is an arithmetic number, because the mean of its divisors is an integer number (38602440).

Almost surely, 2^661101530 is an apocalyptic number.

661101530 is a deficient number, since it is larger than the sum of its proper divisors (574176550).

661101530 is a wasteful number, since it uses less digits than its factorization.

661101530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23174.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 661101530 is about 25711.8947182039. The cubic root of 661101530 is about 871.1428719950.

Adding to 661101530 its reverse (35101166), we get a palindrome (696202696).

The spelling of 661101530 in words is "six hundred sixty-one million, one hundred one thousand, five hundred thirty".