66261367535279 has 32 divisors (see below), whose sum is σ = 80024042628096. Its totient is φ = 53638311767040.

The previous prime is 66261367535261. The next prime is 66261367535281. The reversal of 66261367535279 is 97253576316266.

It is not a de Polignac number, because 66261367535279 - 2²⁰ = 66261366486703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66261367535179) 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, 1535684 + ... + 11613830.

It is an arithmetic number, because the mean of its divisors is an integer number (2500751332128).

Almost surely, 2^{66261367535279} is an apocalyptic number.

66261367535279 is a deficient number, since it is larger than the sum of its proper divisors (13762675092817).

66261367535279 is a wasteful number, since it uses less digits than its factorization.

66261367535279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10078695.

The product of its digits is 514382400, while the sum is 68.

The spelling of 66261367535279 in words is "sixty-six trillion, two hundred sixty-one billion, three hundred sixty-seven million, five hundred thirty-five thousand, two hundred seventy-nine".