66261635014540 has 24 divisors (see below), whose sum is σ = 159027924035232. Its totient is φ = 22718274862080.

The previous prime is 66261635014529. The next prime is 66261635014573. The reversal of 66261635014540 is 4541053616266.

It is a super-2 number, since 2×66261635014540² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236648696341 + ... + 236648696620.

It is an arithmetic number, because the mean of its divisors is an integer number (6626163501468).

Almost surely, 2^{66261635014540} is an apocalyptic number.

It is an amenable number.

66261635014540 is an abundant number, since it is smaller than the sum of its proper divisors (92766289020692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66261635014540 is a wasteful number, since it uses less digits than its factorization.

66261635014540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473297392977 (or 473297392975 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 66261635014540 in words is "sixty-six trillion, two hundred sixty-one billion, six hundred thirty-five million, fourteen thousand, five hundred forty".