766550613 has 4 divisors (see below), whose sum is σ = 1022067488. Its totient is φ = 511033740.

The previous prime is 766550593. The next prime is 766550627. The reversal of 766550613 is 316055667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 316055667 = 3 ⋅105351889.

It is not a de Polignac number, because 766550613 - 2⁵ = 766550581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766550633) 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, 127758433 + ... + 127758438.

It is an arithmetic number, because the mean of its divisors is an integer number (255516872).

Almost surely, 2^766550613 is an apocalyptic number.

It is an amenable number.

766550613 is a deficient number, since it is larger than the sum of its proper divisors (255516875).

766550613 is a wasteful number, since it uses less digits than its factorization.

766550613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255516874.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 766550613 is about 27686.6504474629. The cubic root of 766550613 is about 915.1949430857.

The spelling of 766550613 in words is "seven hundred sixty-six million, five hundred fifty thousand, six hundred thirteen".