7664213261 has 4 divisors (see below), whose sum is σ = 7704340224. Its totient is φ = 7624086300.

The previous prime is 7664213257. The next prime is 7664213269. The reversal of 7664213261 is 1623124667.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7664213261 - 2² = 7664213257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664213269) 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, 20063195 + ... + 20063576.

It is an arithmetic number, because the mean of its divisors is an integer number (1926085056).

Almost surely, 2^7664213261 is an apocalyptic number.

It is an amenable number.

7664213261 is a deficient number, since it is larger than the sum of its proper divisors (40126963).

7664213261 is a wasteful number, since it uses less digits than its factorization.

7664213261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40126962.

The product of its digits is 72576, while the sum is 38.

The square root of 7664213261 is about 87545.4925224594. The cubic root of 7664213261 is about 1971.6168763538.

The spelling of 7664213261 in words is "seven billion, six hundred sixty-four million, two hundred thirteen thousand, two hundred sixty-one".