61570661 has 4 divisors (see below), whose sum is σ = 61596492. Its totient is φ = 61544832.

The previous prime is 61570657. The next prime is 61570679. The reversal of 61570661 is 16607516.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15249025 + 46321636 = 3905^2 + 6806^2 .

It is a cyclic number.

It is not a de Polignac number, because 61570661 - 2² = 61570657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61570631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8930 + ... + 14243.

It is an arithmetic number, because the mean of its divisors is an integer number (15399123).

Almost surely, 2^61570661 is an apocalyptic number.

It is an amenable number.

61570661 is a deficient number, since it is larger than the sum of its proper divisors (25831).

61570661 is a wasteful number, since it uses less digits than its factorization.

61570661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25830.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 61570661 is about 7846.6974581667. The cubic root of 61570661 is about 394.8734540952.

The spelling of 61570661 in words is "sixty-one million, five hundred seventy thousand, six hundred sixty-one".