17661889051 has 2 divisors, whose sum is σ = 17661889052. Its totient is φ = 17661889050.

The previous prime is 17661889027. The next prime is 17661889073. The reversal of 17661889051 is 15098816671.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17661889051 - 2⁵ = 17661889019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17661889051.

It is not a weakly prime, because it can be changed into another prime (17661889001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8830944525 + 8830944526.

It is an arithmetic number, because the mean of its divisors is an integer number (8830944526).

Almost surely, 2^17661889051 is an apocalyptic number.

17661889051 is a deficient number, since it is larger than the sum of its proper divisors (1).

17661889051 is an equidigital number, since it uses as much as digits as its factorization.

17661889051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 17661889051 in words is "seventeen billion, six hundred sixty-one million, eight hundred eighty-nine thousand, fifty-one".