61801606 has 4 divisors (see below), whose sum is σ = 92702412. Its totient is φ = 30900802.

The previous prime is 61801591. The next prime is 61801627. The reversal of 61801606 is 60610816.

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

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, 15450400 + ... + 15450403.

It is an arithmetic number, because the mean of its divisors is an integer number (23175603).

Almost surely, 2^61801606 is an apocalyptic number.

61801606 is a deficient number, since it is larger than the sum of its proper divisors (30900806).

61801606 is a wasteful number, since it uses less digits than its factorization.

61801606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30900805.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 61801606 is about 7861.3997481365. The cubic root of 61801606 is about 395.3665475353.

The spelling of 61801606 in words is "sixty-one million, eight hundred one thousand, six hundred six".