261277677 has 16 divisors (see below), whose sum is σ = 403908480. Its totient is φ = 166611456.

The previous prime is 261277649. The next prime is 261277693. The reversal of 261277677 is 776772162.

It is not a de Polignac number, because 261277677 - 2¹¹ = 261275629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261277477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209748 + ... + 210989.

It is an arithmetic number, because the mean of its divisors is an integer number (25244280).

Almost surely, 2^261277677 is an apocalyptic number.

261277677 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

261277677 is a deficient number, since it is larger than the sum of its proper divisors (142630803).

261277677 is a wasteful number, since it uses less digits than its factorization.

261277677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420769 (or 420763 counting only the distinct ones).

The product of its digits is 345744, while the sum is 45.

The square root of 261277677 is about 16164.0860242700. The cubic root of 261277677 is about 639.2942064731.

The spelling of 261277677 in words is "two hundred sixty-one million, two hundred seventy-seven thousand, six hundred seventy-seven".