345623666 has 4 divisors (see below), whose sum is σ = 518435502. Its totient is φ = 172811832.

The previous prime is 345623647. The next prime is 345623713. The reversal of 345623666 is 666326543.

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

It can be written as a sum of positive squares in only one way, i.e., 268271641 + 77352025 = 16379^2 + 8795^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86405915 + ... + 86405918.

Almost surely, 2^345623666 is an apocalyptic number.

345623666 is a deficient number, since it is larger than the sum of its proper divisors (172811836).

345623666 is a wasteful number, since it uses less digits than its factorization.

345623666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172811835.

The product of its digits is 466560, while the sum is 41.

The square root of 345623666 is about 18590.9565649538. The cubic root of 345623666 is about 701.7802752786.

The spelling of 345623666 in words is "three hundred forty-five million, six hundred twenty-three thousand, six hundred sixty-six".