61660499 has 4 divisors (see below), whose sum is σ = 61803336. Its totient is φ = 61517664.

The previous prime is 61660481. The next prime is 61660507. The reversal of 61660499 is 99406616.

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 61660499 - 2⁸ = 61660243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61660799) 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, 70769 + ... + 71634.

It is an arithmetic number, because the mean of its divisors is an integer number (15450834).

Almost surely, 2^61660499 is an apocalyptic number.

61660499 is a deficient number, since it is larger than the sum of its proper divisors (142837).

61660499 is a wasteful number, since it uses less digits than its factorization.

61660499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142836.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 61660499 is about 7852.4199454690. The cubic root of 61660499 is about 395.0654145789.

The spelling of 61660499 in words is "sixty-one million, six hundred sixty thousand, four hundred ninety-nine".