611661406 has 4 divisors (see below), whose sum is σ = 917492112. Its totient is φ = 305830702.

The previous prime is 611661389. The next prime is 611661443. The reversal of 611661406 is 604166116.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152915350 + ... + 152915353.

It is an arithmetic number, because the mean of its divisors is an integer number (229373028).

Almost surely, 2^611661406 is an apocalyptic number.

611661406 is a deficient number, since it is larger than the sum of its proper divisors (305830706).

611661406 is a wasteful number, since it uses less digits than its factorization.

611661406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305830705.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 611661406 is about 24731.7893812801. The cubic root of 611661406 is about 848.8618705239.

The spelling of 611661406 in words is "six hundred eleven million, six hundred sixty-one thousand, four hundred six".