7777777085401 has 4 divisors (see below), whose sum is σ = 7782599019492. Its totient is φ = 7772955151312.

The previous prime is 7777777085387. The next prime is 7777777085411. The reversal of 7777777085401 is 1045807777777.

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 2088383375376 + 5689393710025 = 1445124^2 + 2385245^2 .

It is a cyclic number.

It is not a de Polignac number, because 7777777085401 - 2²⁹ = 7777240214489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7777777085411) 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, 2410964626 + ... + 2410967851.

It is an arithmetic number, because the mean of its divisors is an integer number (1945649754873).

Almost surely, 2^{7777777085401} is an apocalyptic number.

It is an amenable number.

7777777085401 is a deficient number, since it is larger than the sum of its proper divisors (4821934091).

7777777085401 is a wasteful number, since it uses less digits than its factorization.

7777777085401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4821934090.

The product of its (nonzero) digits is 131766880, while the sum is 67.

The spelling of 7777777085401 in words is "seven trillion, seven hundred seventy-seven billion, seven hundred seventy-seven million, eighty-five thousand, four hundred one".