60661686921 has 16 divisors (see below), whose sum is σ = 88241680128. Its totient is φ = 36761950800.

The previous prime is 60661686919. The next prime is 60661686923. The reversal of 60661686921 is 12968616606.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (60661686919) and next prime (60661686923).

It is not a de Polignac number, because 60661686921 - 2¹ = 60661686919 is a prime.

It is a super-3 number, since 3×60661686921³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (60661686923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445086 + ... + 565176.

It is an arithmetic number, because the mean of its divisors is an integer number (5515105008).

Almost surely, 2^60661686921 is an apocalyptic number.

It is an amenable number.

60661686921 is a deficient number, since it is larger than the sum of its proper divisors (27579993207).

60661686921 is a wasteful number, since it uses less digits than its factorization.

60661686921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135412.

The product of its (nonzero) digits is 1119744, while the sum is 51.

The spelling of 60661686921 in words is "sixty billion, six hundred sixty-one million, six hundred eighty-six thousand, nine hundred twenty-one".