461661011561 has 2 divisors, whose sum is σ = 461661011562. Its totient is φ = 461661011560.

The previous prime is 461661011531. The next prime is 461661011573. The reversal of 461661011561 is 165110166164.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 461338449961 + 322561600 = 679219^2 + 17960^2 .

It is a cyclic number.

It is not a de Polignac number, because 461661011561 - 2²² = 461656817257 is a prime.

It is not a weakly prime, because it can be changed into another prime (461661011521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230830505780 + 230830505781.

It is an arithmetic number, because the mean of its divisors is an integer number (230830505781).

Almost surely, 2^461661011561 is an apocalyptic number.

It is an amenable number.

461661011561 is a deficient number, since it is larger than the sum of its proper divisors (1).

461661011561 is an equidigital number, since it uses as much as digits as its factorization.

461661011561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 461661011561 in words is "four hundred sixty-one billion, six hundred sixty-one million, eleven thousand, five hundred sixty-one".