75661471 has 2 divisors, whose sum is σ = 75661472. Its totient is φ = 75661470.

The previous prime is 75661459. The next prime is 75661517. The reversal of 75661471 is 17416657.

It is a weak prime.

It is an emirp because it is prime and its reverse (17416657) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75661471 - 2⁷ = 75661343 is a prime.

It is a super-3 number, since 3×75661471³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75661471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75661871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37830735 + 37830736.

It is an arithmetic number, because the mean of its divisors is an integer number (37830736).

Almost surely, 2^75661471 is an apocalyptic number.

75661471 is a deficient number, since it is larger than the sum of its proper divisors (1).

75661471 is an equidigital number, since it uses as much as digits as its factorization.

75661471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 75661471 is about 8698.3602477708. The cubic root of 75661471 is about 422.9524972412.

The spelling of 75661471 in words is "seventy-five million, six hundred sixty-one thousand, four hundred seventy-one".