661541053051 has 2 divisors, whose sum is σ = 661541053052. Its totient is φ = 661541053050.

The previous prime is 661541053049. The next prime is 661541053169. The reversal of 661541053051 is 150350145166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661541053051 - 2¹ = 661541053049 is a prime.

Together with 661541053049, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 661541053051.

It is not a weakly prime, because it can be changed into another prime (661541053451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330770526525 + 330770526526.

It is an arithmetic number, because the mean of its divisors is an integer number (330770526526).

Almost surely, 2^661541053051 is an apocalyptic number.

661541053051 is a deficient number, since it is larger than the sum of its proper divisors (1).

661541053051 is an equidigital number, since it uses as much as digits as its factorization.

661541053051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 661541053051 in words is "six hundred sixty-one billion, five hundred forty-one million, fifty-three thousand, fifty-one".