7664137461 has 10 divisors (see below), whose sum is σ = 11448896822. Its totient is φ = 5109424920.

The previous prime is 7664137457. The next prime is 7664137463. The reversal of 7664137461 is 1647314667.

It can be written as a sum of positive squares in only one way, i.e., 6757826436 + 906311025 = 82206^2 + 30105^2 .

It is not a de Polignac number, because 7664137461 - 2² = 7664137457 is a prime.

It is a super-2 number, since 2×7664137461² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664137463) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 47309410 + ... + 47309571.

Almost surely, 2^7664137461 is an apocalyptic number.

It is an amenable number.

7664137461 is a deficient number, since it is larger than the sum of its proper divisors (3784759361).

7664137461 is an equidigital number, since it uses as much as digits as its factorization.

7664137461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94618993 (or 94618984 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 7664137461 is about 87545.0596036121. The cubic root of 7664137461 is about 1971.6103764889.

The spelling of 7664137461 in words is "seven billion, six hundred sixty-four million, one hundred thirty-seven thousand, four hundred sixty-one".