661003223513010 has 128 divisors (see below), whose sum is σ = 1908545002721280. Its totient is φ = 143128190018304.

The previous prime is 661003223512967. The next prime is 661003223513011. The reversal of 661003223513010 is 10315322300166.

It is a super-2 number, since 2×661003223513010² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661003223513011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 86662467 + ... + 93980793.

It is an arithmetic number, because the mean of its divisors is an integer number (14910507833760).

Almost surely, 2^{661003223513010} is an apocalyptic number.

661003223513010 is an abundant number, since it is smaller than the sum of its proper divisors (1247541779208270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661003223513010 is a wasteful number, since it uses less digits than its factorization.

661003223513010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7341000.

The product of its (nonzero) digits is 19440, while the sum is 33.

Adding to 661003223513010 its reverse (10315322300166), we get a palindrome (671318545813176).

The spelling of 661003223513010 in words is "six hundred sixty-one trillion, three billion, two hundred twenty-three million, five hundred thirteen thousand, ten".