1551110011777 has 2 divisors, whose sum is σ = 1551110011778. Its totient is φ = 1551110011776.

The previous prime is 1551110011723. The next prime is 1551110011811. The reversal of 1551110011777 is 7771100111551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1489268766736 + 61841245041 = 1220356^2 + 248679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551110011777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551110011177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775555005888 + 775555005889.

It is an arithmetic number, because the mean of its divisors is an integer number (775555005889).

Almost surely, 2^{1551110011777} is an apocalyptic number.

It is an amenable number.

1551110011777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551110011777 is an equidigital number, since it uses as much as digits as its factorization.

1551110011777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8575, while the sum is 37.

The spelling of 1551110011777 in words is "one trillion, five hundred fifty-one billion, one hundred ten million, eleven thousand, seven hundred seventy-seven".