20415499669 has 2 divisors, whose sum is σ = 20415499670. Its totient is φ = 20415499668.

The previous prime is 20415499661. The next prime is 20415499711. The reversal of 20415499669 is 96699451402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20238476644 + 177023025 = 142262^2 + 13305^2 .

It is a cyclic number.

It is not a de Polignac number, because 20415499669 - 2³ = 20415499661 is a prime.

It is a super-2 number, since 2×20415499669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20415499661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10207749834 + 10207749835.

It is an arithmetic number, because the mean of its divisors is an integer number (10207749835).

Almost surely, 2^20415499669 is an apocalyptic number.

It is an amenable number.

20415499669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20415499669 is an equidigital number, since it uses as much as digits as its factorization.

20415499669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 20415499669 in words is "twenty billion, four hundred fifteen million, four hundred ninety-nine thousand, six hundred sixty-nine".