61660497 has 4 divisors (see below), whose sum is σ = 82214000. Its totient is φ = 41106996.

The previous prime is 61660481. The next prime is 61660507. The reversal of 61660497 is 79406616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61660497 - 2⁴ = 61660481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61660097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10276747 + ... + 10276752.

It is an arithmetic number, because the mean of its divisors is an integer number (20553500).

Almost surely, 2^61660497 is an apocalyptic number.

It is an amenable number.

61660497 is a deficient number, since it is larger than the sum of its proper divisors (20553503).

61660497 is a wasteful number, since it uses less digits than its factorization.

61660497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20553502.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 61660497 is about 7852.4198181198. The cubic root of 61660497 is about 395.0654103075.

The spelling of 61660497 in words is "sixty-one million, six hundred sixty thousand, four hundred ninety-seven".