11605621561451 has 2 divisors, whose sum is σ = 11605621561452. Its totient is φ = 11605621561450.

The previous prime is 11605621561399. The next prime is 11605621561481. The reversal of 11605621561451 is 15416512650611.

It is a happy number.

11605621561451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11605621561451 is a prime.

It is not a weakly prime, because it can be changed into another prime (11605621561481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5802810780725 + 5802810780726.

It is an arithmetic number, because the mean of its divisors is an integer number (5802810780726).

Almost surely, 2^{11605621561451} is an apocalyptic number.

11605621561451 is a deficient number, since it is larger than the sum of its proper divisors (1).

11605621561451 is an equidigital number, since it uses as much as digits as its factorization.

11605621561451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 44.

The spelling of 11605621561451 in words is "eleven trillion, six hundred five billion, six hundred twenty-one million, five hundred sixty-one thousand, four hundred fifty-one".