66126466651 has 4 divisors (see below), whose sum is σ = 75573104752. Its totient is φ = 56679828552.

The previous prime is 66126466621. The next prime is 66126466697. The reversal of 66126466651 is 15666462166.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66126466651 - 2¹⁵ = 66126433883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66126466595 and 66126466604.

It is not an unprimeable number, because it can be changed into a prime (66126466621) 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, 4723319040 + ... + 4723319053.

It is an arithmetic number, because the mean of its divisors is an integer number (18893276188).

Almost surely, 2^66126466651 is an apocalyptic number.

66126466651 is a deficient number, since it is larger than the sum of its proper divisors (9446638101).

66126466651 is an equidigital number, since it uses as much as digits as its factorization.

66126466651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9446638100.

The product of its digits is 1866240, while the sum is 49.

The spelling of 66126466651 in words is "sixty-six billion, one hundred twenty-six million, four hundred sixty-six thousand, six hundred fifty-one".