61660208619 has 24 divisors (see below), whose sum is σ = 89899542720. Its totient is φ = 40721893632.

The previous prime is 61660208611. The next prime is 61660208629. The reversal of 61660208619 is 91680206616.

61660208619 is a `hidden beast` number, since 6 + 1 + 6 + 6 + 0 + 20 + 8 + 619 = 666.

It is not a de Polignac number, because 61660208619 - 2³ = 61660208611 is a prime.

It is a super-2 number, since 2×61660208619² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61660208611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2083377 + ... + 2112765.

It is an arithmetic number, because the mean of its divisors is an integer number (3745814280).

Almost surely, 2^61660208619 is an apocalyptic number.

61660208619 is a deficient number, since it is larger than the sum of its proper divisors (28239334101).

61660208619 is a wasteful number, since it uses less digits than its factorization.

61660208619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31571 (or 31568 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 61660208619 in words is "sixty-one billion, six hundred sixty million, two hundred eight thousand, six hundred nineteen".