7945212661 has 8 divisors (see below), whose sum is σ = 8080922304. Its totient is φ = 7810629600.

The previous prime is 7945212643. The next prime is 7945212683. The reversal of 7945212661 is 1662125497.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7945212661 - 2⁷ = 7945212533 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 (7945212601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267415 + ... + 295636.

It is an arithmetic number, because the mean of its divisors is an integer number (1010115288).

Almost surely, 2^7945212661 is an apocalyptic number.

It is an amenable number.

7945212661 is a deficient number, since it is larger than the sum of its proper divisors (135709643).

7945212661 is a wasteful number, since it uses less digits than its factorization.

7945212661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563291.

The product of its digits is 181440, while the sum is 43.

The square root of 7945212661 is about 89135.9223938363. The cubic root of 7945212661 is about 1995.4239261763.

The spelling of 7945212661 in words is "seven billion, nine hundred forty-five million, two hundred twelve thousand, six hundred sixty-one".