77388145011540 has 192 divisors, whose sum is σ = 265251177757440. Its totient is φ = 18575012160000.

The previous prime is 77388145011511. The next prime is 77388145011581. The reversal of 77388145011540 is 4511054188377.

It is a happy number.

77388145011540 is a `hidden beast` number, since 7 + 7 + 3 + 8 + 81 + 4 + 5 + 0 + 11 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63896631 + ... + 65096510.

It is an arithmetic number, because the mean of its divisors is an integer number (1381516550820).

Almost surely, 2^{77388145011540} is an apocalyptic number.

It is an amenable number.

77388145011540 is an abundant number, since it is smaller than the sum of its proper divisors (187863032745900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77388145011540 is a wasteful number, since it uses less digits than its factorization.

77388145011540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128993271 (or 128993263 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 54.

The spelling of 77388145011540 in words is "seventy-seven trillion, three hundred eighty-eight billion, one hundred forty-five million, eleven thousand, five hundred forty".