661230379571 has 4 divisors (see below), whose sum is σ = 672437674200. Its totient is φ = 650023084944.

The previous prime is 661230379549. The next prime is 661230379739. The reversal of 661230379571 is 175973032166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661230379571 - 2³⁰ = 660156637747 is a prime.

It is a super-2 number, since 2×661230379571² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661230379531) 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, 5603647226 + ... + 5603647343.

It is an arithmetic number, because the mean of its divisors is an integer number (168109418550).

Almost surely, 2^661230379571 is an apocalyptic number.

661230379571 is a deficient number, since it is larger than the sum of its proper divisors (11207294629).

661230379571 is a wasteful number, since it uses less digits than its factorization.

661230379571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11207294628.

The product of its (nonzero) digits is 1428840, while the sum is 50.

The spelling of 661230379571 in words is "six hundred sixty-one billion, two hundred thirty million, three hundred seventy-nine thousand, five hundred seventy-one".