27405425434661 has 4 divisors (see below), whose sum is σ = 27405502161324. Its totient is φ = 27405348708000.

The previous prime is 27405425434643. The next prime is 27405425434691. The reversal of 27405425434661 is 16643452450472.

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 5923961698561 + 21481463736100 = 2433919^2 + 4634810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27405425434661 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 (27405425434691) 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, 37825040 + ... + 38542761.

It is an arithmetic number, because the mean of its divisors is an integer number (6851375540331).

Almost surely, 2^{27405425434661} is an apocalyptic number.

It is an amenable number.

27405425434661 is a deficient number, since it is larger than the sum of its proper divisors (76726663).

27405425434661 is an equidigital number, since it uses as much as digits as its factorization.

27405425434661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76726662.

The product of its (nonzero) digits is 19353600, while the sum is 53.

The spelling of 27405425434661 in words is "twenty-seven trillion, four hundred five billion, four hundred twenty-five million, four hundred thirty-four thousand, six hundred sixty-one".