7661485761438 has 8 divisors (see below), whose sum is σ = 15322971522888. Its totient is φ = 2553828587144.

The previous prime is 7661485761437. The next prime is 7661485761469. The reversal of 7661485761438 is 8341675841667.

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

7661485761438 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661485761437) 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, 638457146781 + ... + 638457146792.

It is an arithmetic number, because the mean of its divisors is an integer number (1915371440361).

Almost surely, 2^{7661485761438} is an apocalyptic number.

7661485761438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7661485761438 is a wasteful number, since it uses less digits than its factorization.

7661485761438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276914293578.

The product of its digits is 162570240, while the sum is 66.

The spelling of 7661485761438 in words is "seven trillion, six hundred sixty-one billion, four hundred eighty-five million, seven hundred sixty-one thousand, four hundred thirty-eight".