61660641 has 32 divisors (see below), whose sum is σ = 98242560. Its totient is φ = 33655104.

The previous prime is 61660639. The next prime is 61660657. The reversal of 61660641 is 14606616.

It is not a de Polignac number, because 61660641 - 2¹ = 61660639 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61660599 and 61660608.

It is not an unprimeable number, because it can be changed into a prime (61660441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62236 + ... + 63218.

It is an arithmetic number, because the mean of its divisors is an integer number (3070080).

Almost surely, 2^61660641 is an apocalyptic number.

It is an amenable number.

61660641 is a deficient number, since it is larger than the sum of its proper divisors (36581919).

61660641 is a wasteful number, since it uses less digits than its factorization.

61660641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 61660641 is about 7852.4289872625. The cubic root of 61660641 is about 395.0657178484.

The spelling of 61660641 in words is "sixty-one million, six hundred sixty thousand, six hundred forty-one".