661076047 has 2 divisors, whose sum is σ = 661076048. Its totient is φ = 661076046.

The previous prime is 661076027. The next prime is 661076057. The reversal of 661076047 is 740670166.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661076047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661075997 and 661076015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661076027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330538023 + 330538024.

It is an arithmetic number, because the mean of its divisors is an integer number (330538024).

Almost surely, 2^661076047 is an apocalyptic number.

661076047 is a deficient number, since it is larger than the sum of its proper divisors (1).

661076047 is an equidigital number, since it uses as much as digits as its factorization.

661076047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 661076047 is about 25711.3991645729. The cubic root of 661076047 is about 871.1316787475.

The spelling of 661076047 in words is "six hundred sixty-one million, seventy-six thousand, forty-seven".