7354777681 has 4 divisors (see below), whose sum is σ = 7427597364. Its totient is φ = 7281958000.

The previous prime is 7354777669. The next prime is 7354777693. The reversal of 7354777681 is 1867774537.

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

It is an interprime number because it is at equal distance from previous prime (7354777669) and next prime (7354777693).

It can be written as a sum of positive squares in 2 ways, for example, as 7066083600 + 288694081 = 84060^2 + 16991^2 .

It is a cyclic number.

It is not a de Polignac number, because 7354777681 - 2¹¹ = 7354775633 is a prime.

It is a super-2 number, since 2×7354777681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7354787681) 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, 36409690 + ... + 36409891.

It is an arithmetic number, because the mean of its divisors is an integer number (1856899341).

Almost surely, 2^7354777681 is an apocalyptic number.

It is an amenable number.

7354777681 is a deficient number, since it is larger than the sum of its proper divisors (72819683).

7354777681 is a wasteful number, since it uses less digits than its factorization.

7354777681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72819682.

The product of its digits is 6914880, while the sum is 55.

The square root of 7354777681 is about 85760.0004722481. Note that the first 3 decimals coincide. The cubic root of 7354777681 is about 1944.7174739146.

It can be divided in two parts, 73547776 and 81, that multiplied together give a square (5957369856 = 77184²).

The spelling of 7354777681 in words is "seven billion, three hundred fifty-four million, seven hundred seventy-seven thousand, six hundred eighty-one".