61661597 has 8 divisors (see below), whose sum is σ = 64438080. Its totient is φ = 58893120.

The previous prime is 61661539. The next prime is 61661617. The reversal of 61661597 is 79516616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61661597 - 2¹⁸ = 61399453 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 (61621597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18197 + ... + 21317.

It is an arithmetic number, because the mean of its divisors is an integer number (8054760).

Almost surely, 2^61661597 is an apocalyptic number.

It is an amenable number.

61661597 is a deficient number, since it is larger than the sum of its proper divisors (2776483).

61661597 is a wasteful number, since it uses less digits than its factorization.

61661597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003.

The product of its digits is 68040, while the sum is 41.

The square root of 61661597 is about 7852.4898599107. The cubic root of 61661597 is about 395.0677595662.

The spelling of 61661597 in words is "sixty-one million, six hundred sixty-one thousand, five hundred ninety-seven".