66620157451 has 2 divisors, whose sum is σ = 66620157452. Its totient is φ = 66620157450.

The previous prime is 66620157389. The next prime is 66620157479. The reversal of 66620157451 is 15475102666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66620157451 - 2¹⁹ = 66619633163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66620157398 and 66620157407.

It is not a weakly prime, because it can be changed into another prime (66620157151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33310078725 + 33310078726.

It is an arithmetic number, because the mean of its divisors is an integer number (33310078726).

Almost surely, 2^66620157451 is an apocalyptic number.

66620157451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66620157451 is an equidigital number, since it uses as much as digits as its factorization.

66620157451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 66620157451 in words is "sixty-six billion, six hundred twenty million, one hundred fifty-seven thousand, four hundred fifty-one".