61660501 has 4 divisors (see below), whose sum is σ = 70469152. Its totient is φ = 52851852.

The previous prime is 61660481. The next prime is 61660507. The reversal of 61660501 is 10506616.

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 a cyclic number.

It is not a de Polignac number, because 61660501 - 2⁷ = 61660373 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 (61660507) 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, 4404315 + ... + 4404328.

It is an arithmetic number, because the mean of its divisors is an integer number (17617288).

Almost surely, 2^61660501 is an apocalyptic number.

It is an amenable number.

61660501 is a deficient number, since it is larger than the sum of its proper divisors (8808651).

61660501 is an equidigital number, since it uses as much as digits as its factorization.

61660501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8808650.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 61660501 is about 7852.4200728183. The cubic root of 61660501 is about 395.0654188503.

The spelling of 61660501 in words is "sixty-one million, six hundred sixty thousand, five hundred one".