7661764543 has 4 divisors (see below), whose sum is σ = 7669450360. Its totient is φ = 7654078728.

The previous prime is 7661764541. The next prime is 7661764547. The reversal of 7661764543 is 3454671667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3454671667 = 139 ⋅24853753.

It is a cyclic number.

It is not a de Polignac number, because 7661764543 - 2¹ = 7661764541 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 (7661764541) 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, 3841413 + ... + 3843406.

It is an arithmetic number, because the mean of its divisors is an integer number (1917362590).

Almost surely, 2^7661764543 is an apocalyptic number.

7661764543 is a deficient number, since it is larger than the sum of its proper divisors (7685817).

7661764543 is an equidigital number, since it uses as much as digits as its factorization.

7661764543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7685816.

The product of its digits is 2540160, while the sum is 49.

The square root of 7661764543 is about 87531.5060021247. The cubic root of 7661764543 is about 1971.4068766301.

The spelling of 7661764543 in words is "seven billion, six hundred sixty-one million, seven hundred sixty-four thousand, five hundred forty-three".