61661594 has 4 divisors (see below), whose sum is σ = 92492394. Its totient is φ = 30830796.

The previous prime is 61661539. The next prime is 61661617. The reversal of 61661594 is 49516616.

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., 59521225 + 2140369 = 7715^2 + 1463^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15415397 + ... + 15415400.

Almost surely, 2^61661594 is an apocalyptic number.

61661594 is a deficient number, since it is larger than the sum of its proper divisors (30830800).

61661594 is a wasteful number, since it uses less digits than its factorization.

61661594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30830799.

The product of its digits is 38880, while the sum is 38.

The square root of 61661594 is about 7852.4896688885. The cubic root of 61661594 is about 395.0677531591.

The spelling of 61661594 in words is "sixty-one million, six hundred sixty-one thousand, five hundred ninety-four".