18901574288981 has 2 divisors, whose sum is σ = 18901574288982. Its totient is φ = 18901574288980.

The previous prime is 18901574288969. The next prime is 18901574289007. The reversal of 18901574288981 is 18988247510981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15648749222500 + 3252825066481 = 3955850^2 + 1803559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18901574288981 is a prime.

It is a super-2 number, since 2×18901574288981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18901577288981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9450787144490 + 9450787144491.

It is an arithmetic number, because the mean of its divisors is an integer number (9450787144491).

Almost surely, 2^{18901574288981} is an apocalyptic number.

It is an amenable number.

18901574288981 is a deficient number, since it is larger than the sum of its proper divisors (1).

18901574288981 is an equidigital number, since it uses as much as digits as its factorization.

18901574288981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92897280, while the sum is 71.

The spelling of 18901574288981 in words is "eighteen trillion, nine hundred one billion, five hundred seventy-four million, two hundred eighty-eight thousand, nine hundred eighty-one".