75766378878421 has 16 divisors (see below), whose sum is σ = 94467379294080. Its totient is φ = 59035361518080.

The previous prime is 75766378878353. The next prime is 75766378878467. The reversal of 75766378878421 is 12487887366757.

It is a cyclic number.

It is not a de Polignac number, because 75766378878421 - 2¹³ = 75766378870229 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 (75766378858421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26771236 + ... + 29465773.

It is an arithmetic number, because the mean of its divisors is an integer number (5904211205880).

Almost surely, 2^{75766378878421} is an apocalyptic number.

It is an amenable number.

75766378878421 is a deficient number, since it is larger than the sum of its proper divisors (18701000415659).

75766378878421 is a wasteful number, since it uses less digits than its factorization.

75766378878421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56254524.

The product of its digits is 5310627840, while the sum is 79.

The spelling of 75766378878421 in words is "seventy-five trillion, seven hundred sixty-six billion, three hundred seventy-eight million, eight hundred seventy-eight thousand, four hundred twenty-one".