77668551 has 10 divisors (see below), whose sum is σ = 116023512. Its totient is φ = 51778980.

The previous prime is 77668543. The next prime is 77668553. The reversal of 77668551 is 15586677.

It is not a de Polignac number, because 77668551 - 2³ = 77668543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77668497 and 77668506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77668553) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 479355 + ... + 479516.

Almost surely, 2^77668551 is an apocalyptic number.

77668551 is a deficient number, since it is larger than the sum of its proper divisors (38354961).

77668551 is an equidigital number, since it uses as much as digits as its factorization.

77668551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958883 (or 958874 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 77668551 is about 8812.9762850016. The cubic root of 77668551 is about 426.6598087141.

The spelling of 77668551 in words is "seventy-seven million, six hundred sixty-eight thousand, five hundred fifty-one".