75078420257 has 4 divisors (see below), whose sum is σ = 79029916080. Its totient is φ = 71126924436.

The previous prime is 75078420199. The next prime is 75078420283. The reversal of 75078420257 is 75202487057.

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: 75202487057 = 1021 ⋅73655717.

It is a cyclic number.

It is not a de Polignac number, because 75078420257 - 2¹⁶ = 75078354721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75078423257) 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 in 3 ways as a sum of consecutive naturals, for example, 1975747883 + ... + 1975747920.

It is an arithmetic number, because the mean of its divisors is an integer number (19757479020).

Almost surely, 2^75078420257 is an apocalyptic number.

It is an amenable number.

75078420257 is a deficient number, since it is larger than the sum of its proper divisors (3951495823).

75078420257 is a wasteful number, since it uses less digits than its factorization.

75078420257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951495822.

The product of its (nonzero) digits is 1097600, while the sum is 47.

The spelling of 75078420257 in words is "seventy-five billion, seventy-eight million, four hundred twenty thousand, two hundred fifty-seven".