661528363 has 2 divisors, whose sum is σ = 661528364. Its totient is φ = 661528362.

The previous prime is 661528349. The next prime is 661528379. The reversal of 661528363 is 363825166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661528363 - 2²¹ = 659431211 is a prime.

It is not a weakly prime, because it can be changed into another prime (661528333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330764181 + 330764182.

It is an arithmetic number, because the mean of its divisors is an integer number (330764182).

Almost surely, 2^661528363 is an apocalyptic number.

661528363 is a deficient number, since it is larger than the sum of its proper divisors (1).

661528363 is an equidigital number, since it uses as much as digits as its factorization.

661528363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The square root of 661528363 is about 25720.1936812303. The cubic root of 661528363 is about 871.3303129624.

The spelling of 661528363 in words is "six hundred sixty-one million, five hundred twenty-eight thousand, three hundred sixty-three".