77430900817 has 4 divisors (see below), whose sum is σ = 77447306916. Its totient is φ = 77414494720.

The previous prime is 77430900793. The next prime is 77430900823. The reversal of 77430900817 is 71800903477.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13126055761 + 64304845056 = 114569^2 + 253584^2 .

It is a cyclic number.

It is not a de Polignac number, because 77430900817 - 2⁷ = 77430900689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77430901817) 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, 8195968 + ... + 8205409.

It is an arithmetic number, because the mean of its divisors is an integer number (19361826729).

Almost surely, 2^77430900817 is an apocalyptic number.

It is an amenable number.

77430900817 is a deficient number, since it is larger than the sum of its proper divisors (16406099).

77430900817 is a wasteful number, since it uses less digits than its factorization.

77430900817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16406098.

The product of its (nonzero) digits is 296352, while the sum is 46.

It can be divided in two parts, 774 and 30900817, that added together give a triangular number (30901591 = T₇₈₆₁).

The spelling of 77430900817 in words is "seventy-seven billion, four hundred thirty million, nine hundred thousand, eight hundred seventeen".