345660661 has 4 divisors (see below), whose sum is σ = 348299424. Its totient is φ = 343021900.

The previous prime is 345660649. The next prime is 345660671. The reversal of 345660661 is 166066543.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166066543 = 53 ⋅3133331.

It is a cyclic number.

It is not a de Polignac number, because 345660661 - 2¹¹ = 345658613 is a prime.

It is a super-3 number, since 3×345660661³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 345660661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345660641) 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, 1319185 + ... + 1319446.

It is an arithmetic number, because the mean of its divisors is an integer number (87074856).

Almost surely, 2^345660661 is an apocalyptic number.

It is an amenable number.

345660661 is a deficient number, since it is larger than the sum of its proper divisors (2638763).

345660661 is a wasteful number, since it uses less digits than its factorization.

345660661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638762.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 345660661 is about 18591.9515113395. The cubic root of 345660661 is about 701.8053135283.

The spelling of 345660661 in words is "three hundred forty-five million, six hundred sixty thousand, six hundred sixty-one".