261777772 has 6 divisors (see below), whose sum is σ = 458111108. Its totient is φ = 130888884.

The previous prime is 261777739. The next prime is 261777821. The reversal of 261777772 is 277777162.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32722218 + ... + 32722225.

Almost surely, 2^261777772 is an apocalyptic number.

It is an amenable number.

261777772 is a deficient number, since it is larger than the sum of its proper divisors (196333336).

261777772 is a wasteful number, since it uses less digits than its factorization.

261777772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65444447 (or 65444445 counting only the distinct ones).

The product of its digits is 403368, while the sum is 46.

The square root of 261777772 is about 16179.5479541302. The cubic root of 261777772 is about 639.7018239920.

The spelling of 261777772 in words is "two hundred sixty-one million, seven hundred seventy-seven thousand, seven hundred seventy-two".