1517661679 has 2 divisors, whose sum is σ = 1517661680. Its totient is φ = 1517661678.

The previous prime is 1517661667. The next prime is 1517661697. The reversal of 1517661679 is 9761667151.

Together with next prime (1517661697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1517661679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1517661659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758830839 + 758830840.

It is an arithmetic number, because the mean of its divisors is an integer number (758830840).

Almost surely, 2^1517661679 is an apocalyptic number.

1517661679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1517661679 is an equidigital number, since it uses as much as digits as its factorization.

1517661679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 49.

The square root of 1517661679 is about 38957.1775029968. The cubic root of 1517661679 is about 1149.1895181584.

The spelling of 1517661679 in words is "one billion, five hundred seventeen million, six hundred sixty-one thousand, six hundred seventy-nine".