147778561 has 12 divisors (see below), whose sum is σ = 180954480. Its totient is φ = 119999880.

The previous prime is 147778559. The next prime is 147778583. The reversal of 147778561 is 165877741.

It is not a de Polignac number, because 147778561 - 2¹ = 147778559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (147778531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78435 + ... + 80296.

It is an arithmetic number, because the mean of its divisors is an integer number (15079540).

Almost surely, 2^147778561 is an apocalyptic number.

It is an amenable number.

147778561 is a deficient number, since it is larger than the sum of its proper divisors (33175919).

147778561 is a wasteful number, since it uses less digits than its factorization.

147778561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158764 (or 158757 counting only the distinct ones).

The product of its digits is 329280, while the sum is 46.

The square root of 147778561 is about 12156.4205669268. The cubic root of 147778561 is about 528.6933053091.

The spelling of 147778561 in words is "one hundred forty-seven million, seven hundred seventy-eight thousand, five hundred sixty-one".