661101343 has 8 divisors (see below), whose sum is σ = 773972640. Its totient is φ = 552837120.

The previous prime is 661101341. The next prime is 661101367. The reversal of 661101343 is 343101166.

It is a happy number.

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 661101343 - 2¹ = 661101341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661101341) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1151458 + ... + 1152031.

It is an arithmetic number, because the mean of its divisors is an integer number (96746580).

Almost surely, 2^661101343 is an apocalyptic number.

661101343 is a deficient number, since it is larger than the sum of its proper divisors (112871297).

661101343 is a wasteful number, since it uses less digits than its factorization.

661101343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303537.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 661101343 is about 25711.8910817544. The cubic root of 661101343 is about 871.1427898575.

The spelling of 661101343 in words is "six hundred sixty-one million, one hundred one thousand, three hundred forty-three".