775903921065 has 384 divisors, whose sum is σ = 1734546078720. Its totient is φ = 312166711296.

The previous prime is 775903921061. The next prime is 775903921069. The reversal of 775903921065 is 560129309577.

775903921065 is a `hidden beast` number, since 7 + 7 + 590 + 39 + 2 + 10 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (775903921061) and next prime (775903921069).

It is not a de Polignac number, because 775903921065 - 2² = 775903921061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (775903921061) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 2198027929 + ... + 2198028281.

It is an arithmetic number, because the mean of its divisors is an integer number (4517047080).

Almost surely, 2^775903921065 is an apocalyptic number.

It is an amenable number.

775903921065 is an abundant number, since it is smaller than the sum of its proper divisors (958642157655).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

775903921065 is a wasteful number, since it uses less digits than its factorization.

775903921065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 3572100, while the sum is 54.

The spelling of 775903921065 in words is "seven hundred seventy-five billion, nine hundred three million, nine hundred twenty-one thousand, sixty-five".