57661323346405 has 4 divisors (see below), whose sum is σ = 69193588015692. Its totient is φ = 46129058677120.

The previous prime is 57661323346391. The next prime is 57661323346409. The reversal of 57661323346405 is 50464332316675.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16117639443684 + 41543683902721 = 4014678^2 + 6445439^2 .

It is a de Polignac number, because none of the positive numbers 2^k-57661323346405 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 (57661323346409) 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, 5766132334636 + ... + 5766132334645.

It is an arithmetic number, because the mean of its divisors is an integer number (17298397003923).

Almost surely, 2^{57661323346405} is an apocalyptic number.

It is an amenable number.

57661323346405 is a deficient number, since it is larger than the sum of its proper divisors (11532264669287).

57661323346405 is a wasteful number, since it uses less digits than its factorization.

57661323346405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11532264669286.

The product of its (nonzero) digits is 32659200, while the sum is 55.

The spelling of 57661323346405 in words is "fifty-seven trillion, six hundred sixty-one billion, three hundred twenty-three million, three hundred forty-six thousand, four hundred five".