78522141561 has 32 divisors (see below), whose sum is σ = 108793651200. Its totient is φ = 50344519680.

The previous prime is 78522141557. The next prime is 78522141571. The reversal of 78522141561 is 16514122587.

It is a happy number.

It is not a de Polignac number, because 78522141561 - 2² = 78522141557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78522141541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2333625 + ... + 2367033.

It is an arithmetic number, because the mean of its divisors is an integer number (3399801600).

Almost surely, 2^78522141561 is an apocalyptic number.

It is an amenable number.

78522141561 is a deficient number, since it is larger than the sum of its proper divisors (30271509639).

78522141561 is a wasteful number, since it uses less digits than its factorization.

78522141561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33749.

The product of its digits is 134400, while the sum is 42.

The spelling of 78522141561 in words is "seventy-eight billion, five hundred twenty-two million, one hundred forty-one thousand, five hundred sixty-one".