7661564471 has 32 divisors (see below), whose sum is σ = 9151211520. Its totient is φ = 6332774400.

The previous prime is 7661564467. The next prime is 7661564527. The reversal of 7661564471 is 1744651667.

It is a cyclic number.

It is not a de Polignac number, because 7661564471 - 2² = 7661564467 is a prime.

It is a super-3 number, since 3×7661564471³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661564971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5906495 + ... + 5907791.

It is an arithmetic number, because the mean of its divisors is an integer number (285975360).

Almost surely, 2^7661564471 is an apocalyptic number.

7661564471 is a deficient number, since it is larger than the sum of its proper divisors (1489647049).

7661564471 is a wasteful number, since it uses less digits than its factorization.

7661564471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375.

The product of its digits is 846720, while the sum is 47.

The square root of 7661564471 is about 87530.3631375993. The cubic root of 7661564471 is about 1971.3897166688.

The spelling of 7661564471 in words is "seven billion, six hundred sixty-one million, five hundred sixty-four thousand, four hundred seventy-one".