77755553651 has 2 divisors, whose sum is σ = 77755553652. Its totient is φ = 77755553650.

The previous prime is 77755553609. The next prime is 77755553657. The reversal of 77755553651 is 15635555777.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77755553651 - 2¹⁰ = 77755552627 is a prime.

It is a super-2 number, since 2×77755553651² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (77755553657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38877776825 + 38877776826.

It is an arithmetic number, because the mean of its divisors is an integer number (38877776826).

Almost surely, 2^77755553651 is an apocalyptic number.

77755553651 is a deficient number, since it is larger than the sum of its proper divisors (1).

77755553651 is an equidigital number, since it uses as much as digits as its factorization.

77755553651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19293750, while the sum is 56.

The spelling of 77755553651 in words is "seventy-seven billion, seven hundred fifty-five million, five hundred fifty-three thousand, six hundred fifty-one".