7701642081 has 75 divisors (see below), whose sum is σ = 13489394721. Its totient is φ = 4378823064.

The previous prime is 7701642079. The next prime is 7701642119. The reversal of 7701642081 is 1802461077.

The square root of 7701642081 is 87759.

It is a perfect power (a square), and thus also a powerful number.

7701642081 is a `hidden beast` number, since 7 + 7 + 0 + 1 + 642 + 0 + 8 + 1 = 666.

It is not a de Polignac number, because 7701642081 - 2¹ = 7701642079 is a prime.

It is a super-2 number, since 2×7701642081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7701642071) by changing a digit.

It is a polite number, since it can be written in 74 ways as a sum of consecutive naturals, for example, 38701620 + ... + 38701818.

Almost surely, 2^7701642081 is an apocalyptic number.

7701642081 is the 87759-th square number.

7701642081 is the 43880-th centered octagonal number.

It is an amenable number.

7701642081 is a deficient number, since it is larger than the sum of its proper divisors (5787752640).

7701642081 is an frugal number, since it uses more digits than its factorization.

7701642081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The cubic root of 7701642081 is about 1974.8211839173.

Multiplying 7701642081 by its sum of digits (36), we get a square (277259114916 = 526554²).

The spelling of 7701642081 in words is "seven billion, seven hundred one million, six hundred forty-two thousand, eighty-one".