75666477 has 4 divisors (see below), whose sum is σ = 100888640. Its totient is φ = 50444316.

The previous prime is 75666469. The next prime is 75666491. The reversal of 75666477 is 77466657.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77466657 = 3 ⋅25822219.

It is not a de Polignac number, because 75666477 - 2³ = 75666469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75666427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12611077 + ... + 12611082.

It is an arithmetic number, because the mean of its divisors is an integer number (25222160).

Almost surely, 2^75666477 is an apocalyptic number.

It is an amenable number.

75666477 is a deficient number, since it is larger than the sum of its proper divisors (25222163).

75666477 is a wasteful number, since it uses less digits than its factorization.

75666477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25222162.

The product of its digits is 1481760, while the sum is 48.

The square root of 75666477 is about 8698.6479983961. The cubic root of 75666477 is about 422.9618249896.

The spelling of 75666477 in words is "seventy-five million, six hundred sixty-six thousand, four hundred seventy-seven".