70188661 has 2 divisors, whose sum is σ = 70188662. Its totient is φ = 70188660.

The previous prime is 70188659. The next prime is 70188673. The reversal of 70188661 is 16688107.

70188661 = T₆₈₃₉ + T₆₈₄₀ + T₆₈₄₁.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68989636 + 1199025 = 8306^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 70188661 - 2¹ = 70188659 is a prime.

Together with 70188659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 70188661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70188611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35094330 + 35094331.

It is an arithmetic number, because the mean of its divisors is an integer number (35094331).

Almost surely, 2^70188661 is an apocalyptic number.

70188661 is the 6841-st centered triangular number.

It is an amenable number.

70188661 is a deficient number, since it is larger than the sum of its proper divisors (1).

70188661 is an equidigital number, since it uses as much as digits as its factorization.

70188661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 70188661 is about 8377.8673300548. The cubic root of 70188661 is about 412.4984482341.

The spelling of 70188661 in words is "seventy million, one hundred eighty-eight thousand, six hundred sixty-one".