61660689770 has 8 divisors (see below), whose sum is σ = 110989241604. Its totient is φ = 24664275904.

The previous prime is 61660689763. The next prime is 61660689799. The reversal of 61660689770 is 7798606616.

It can be written as a sum of positive squares in 2 ways, for example, as 59224576321 + 2436113449 = 243361^2 + 49357^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3083034479 + ... + 3083034498.

Almost surely, 2^61660689770 is an apocalyptic number.

61660689770 is a deficient number, since it is larger than the sum of its proper divisors (49328551834).

61660689770 is a wasteful number, since it uses less digits than its factorization.

61660689770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6166068984.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 61660689770 in words is "sixty-one billion, six hundred sixty million, six hundred eighty-nine thousand, seven hundred seventy".