61664479 has 4 divisors (see below), whose sum is σ = 61701640. Its totient is φ = 61627320.

The previous prime is 61664467. The next prime is 61664497. The reversal of 61664479 is 97446616.

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

It is a cyclic number.

It is not a de Polignac number, because 61664479 - 2¹¹ = 61662431 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 (61664579) 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, 15969 + ... + 19450.

It is an arithmetic number, because the mean of its divisors is an integer number (15425410).

Almost surely, 2^61664479 is an apocalyptic number.

61664479 is a deficient number, since it is larger than the sum of its proper divisors (37161).

61664479 is a wasteful number, since it uses less digits than its factorization.

61664479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37160.

The product of its digits is 217728, while the sum is 43.

The square root of 61664479 is about 7852.6733664402. The cubic root of 61664479 is about 395.0739144913.

The spelling of 61664479 in words is "sixty-one million, six hundred sixty-four thousand, four hundred seventy-nine".