66610879137901 has 4 divisors (see below), whose sum is σ = 76126719014752. Its totient is φ = 57095039261052.

The previous prime is 66610879137883. The next prime is 66610879137923. The reversal of 66610879137901 is 10973197801666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66610879137901 - 2⁹ = 66610879137389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66610879137991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4757919938415 + ... + 4757919938428.

It is an arithmetic number, because the mean of its divisors is an integer number (19031679753688).

Almost surely, 2^{66610879137901} is an apocalyptic number.

It is an amenable number.

66610879137901 is a deficient number, since it is larger than the sum of its proper divisors (9515839876851).

66610879137901 is an equidigital number, since it uses as much as digits as its factorization.

66610879137901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9515839876850.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 66610879137901 in words is "sixty-six trillion, six hundred ten billion, eight hundred seventy-nine million, one hundred thirty-seven thousand, nine hundred one".