661363519 has 2 divisors, whose sum is σ = 661363520. Its totient is φ = 661363518.

The previous prime is 661363489. The next prime is 661363523. The reversal of 661363519 is 915363166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661363519 - 2¹³ = 661355327 is a prime.

It is a super-2 number, since 2×661363519² = 874803408528126722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661360519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330681759 + 330681760.

It is an arithmetic number, because the mean of its divisors is an integer number (330681760).

Almost surely, 2^661363519 is an apocalyptic number.

661363519 is a deficient number, since it is larger than the sum of its proper divisors (1).

661363519 is an equidigital number, since it uses as much as digits as its factorization.

661363519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 40.

The square root of 661363519 is about 25716.9889178341. The cubic root of 661363519 is about 871.2579323388.

The spelling of 661363519 in words is "six hundred sixty-one million, three hundred sixty-three thousand, five hundred nineteen".