75715123257661 has 4 divisors (see below), whose sum is σ = 76054652958592. Its totient is φ = 75375593556732.

The previous prime is 75715123257623. The next prime is 75715123257667. The reversal of 75715123257661 is 16675232151757.

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 75715123257661 - 2³¹ = 75712975774013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75715123257596 and 75715123257605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75715123257667) 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, 169764850131 + ... + 169764850576.

It is an arithmetic number, because the mean of its divisors is an integer number (19013663239648).

Almost surely, 2^{75715123257661} is an apocalyptic number.

It is an amenable number.

75715123257661 is a deficient number, since it is larger than the sum of its proper divisors (339529700931).

75715123257661 is a wasteful number, since it uses less digits than its factorization.

75715123257661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339529700930.

The product of its digits is 18522000, while the sum is 58.

The spelling of 75715123257661 in words is "seventy-five trillion, seven hundred fifteen billion, one hundred twenty-three million, two hundred fifty-seven thousand, six hundred sixty-one".