766551 has 4 divisors (see below), whose sum is σ = 1022072. Its totient is φ = 511032.

The previous prime is 766543. The next prime is 766553. The reversal of 766551 is 155667.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 766551 - 2³ = 766543 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127756 + ... + 127761.

It is an arithmetic number, because the mean of its divisors is an integer number (255518).

2⁷⁶⁶⁵⁵¹ is an apocalyptic number.

766551 is a deficient number, since it is larger than the sum of its proper divisors (255521).

766551 is a wasteful number, since it uses less digits than its factorization.

766551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255520.

The product of its digits is 6300, while the sum is 30.

The square root of 766551 is about 875.5289829583. The cubic root of 766551 is about 91.5195097101.

The spelling of 766551 in words is "seven hundred sixty-six thousand, five hundred fifty-one".