661348783 has 2 divisors, whose sum is σ = 661348784. Its totient is φ = 661348782.

The previous prime is 661348777. The next prime is 661348801. The reversal of 661348783 is 387843166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661348783 - 2¹³ = 661340591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661348733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330674391 + 330674392.

It is an arithmetic number, because the mean of its divisors is an integer number (330674392).

Almost surely, 2^661348783 is an apocalyptic number.

661348783 is a deficient number, since it is larger than the sum of its proper divisors (1).

661348783 is an equidigital number, since it uses as much as digits as its factorization.

661348783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 661348783 is about 25716.7024130233. The cubic root of 661348783 is about 871.2514613881.

The spelling of 661348783 in words is "six hundred sixty-one million, three hundred forty-eight thousand, seven hundred eighty-three".