69669661 has 2 divisors, whose sum is σ = 69669662. Its totient is φ = 69669660.

The previous prime is 69669647. The next prime is 69669671. The reversal of 69669661 is 16696696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38365636 + 31304025 = 6194^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 69669661 - 2²³ = 61281053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69669601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34834830 + 34834831.

It is an arithmetic number, because the mean of its divisors is an integer number (34834831).

Almost surely, 2^69669661 is an apocalyptic number.

It is an amenable number.

69669661 is a deficient number, since it is larger than the sum of its proper divisors (1).

69669661 is an equidigital number, since it uses as much as digits as its factorization.

69669661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 49.

The square root of 69669661 is about 8346.8353883373. The cubic root of 69669661 is about 411.4792116613.

The spelling of 69669661 in words is "sixty-nine million, six hundred sixty-nine thousand, six hundred sixty-one".