661167371 has 2 divisors, whose sum is σ = 661167372. Its totient is φ = 661167370.

The previous prime is 661167347. The next prime is 661167379. The reversal of 661167371 is 173761166.

661167371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661167371 - 2⁶ = 661167307 is a prime.

It is not a weakly prime, because it can be changed into another prime (661167379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330583685 + 330583686.

It is an arithmetic number, because the mean of its divisors is an integer number (330583686).

Almost surely, 2^661167371 is an apocalyptic number.

661167371 is a deficient number, since it is larger than the sum of its proper divisors (1).

661167371 is an equidigital number, since it uses as much as digits as its factorization.

661167371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 661167371 is about 25713.1750470454. The cubic root of 661167371 is about 871.1717909085.

The spelling of 661167371 in words is "six hundred sixty-one million, one hundred sixty-seven thousand, three hundred seventy-one".