78750412537949 has 4 divisors (see below), whose sum is σ = 80581817480736. Its totient is φ = 76919007595164.

The previous prime is 78750412537919. The next prime is 78750412537963. The reversal of 78750412537949 is 94973521405787.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78750412537949 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 (78750412537919) 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 3 ways as a sum of consecutive naturals, for example, 915702471329 + ... + 915702471414.

It is an arithmetic number, because the mean of its divisors is an integer number (20145454370184).

Almost surely, 2^{78750412537949} is an apocalyptic number.

It is an amenable number.

78750412537949 is a deficient number, since it is larger than the sum of its proper divisors (1831404942787).

78750412537949 is a wasteful number, since it uses less digits than its factorization.

78750412537949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831404942786.

The product of its (nonzero) digits is 533433600, while the sum is 71.

The spelling of 78750412537949 in words is "seventy-eight trillion, seven hundred fifty billion, four hundred twelve million, five hundred thirty-seven thousand, nine hundred forty-nine".