774661511551 has 2 divisors, whose sum is σ = 774661511552. Its totient is φ = 774661511550.

The previous prime is 774661511479. The next prime is 774661511563. The reversal of 774661511551 is 155115166477.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 774661511551 - 2²⁷ = 774527293823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 774661511495 and 774661511504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (774661211551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387330755775 + 387330755776.

It is an arithmetic number, because the mean of its divisors is an integer number (387330755776).

Almost surely, 2^774661511551 is an apocalyptic number.

774661511551 is a deficient number, since it is larger than the sum of its proper divisors (1).

774661511551 is an equidigital number, since it uses as much as digits as its factorization.

774661511551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 882000, while the sum is 49.

The spelling of 774661511551 in words is "seven hundred seventy-four billion, six hundred sixty-one million, five hundred eleven thousand, five hundred fifty-one".