661534325243 has 8 divisors (see below), whose sum is σ = 724223896896. Its totient is φ = 599269768200.

The previous prime is 661534325239. The next prime is 661534325327. The reversal of 661534325243 is 342523435166.

It is a happy number.

661534325243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661534325243 - 2² = 661534325239 is a prime.

It is a super-2 number, since 2×661534325243² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661534325194 and 661534325203.

It is not an unprimeable number, because it can be changed into a prime (661534327243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106250393 + ... + 106256618.

It is an arithmetic number, because the mean of its divisors is an integer number (90527987112).

Almost surely, 2^661534325243 is an apocalyptic number.

661534325243 is a deficient number, since it is larger than the sum of its proper divisors (62689571653).

661534325243 is a wasteful number, since it uses less digits than its factorization.

661534325243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212507305.

The product of its digits is 1555200, while the sum is 44.

The spelling of 661534325243 in words is "six hundred sixty-one billion, five hundred thirty-four million, three hundred twenty-five thousand, two hundred forty-three".